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3 (three) is a
number A number is a mathematical object used to count, measure, and label. The original examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers can be represented in language with number words. More universally, individual numbers c ...
, numeral and
digit Digit may refer to: Mathematics and science * Numerical digit, as used in mathematics or computer science ** Hindu-Arabic numerals, the most common modern representation of numerical digits * Digit (anatomy), the most distal part of a limb, such ...
. It is the
natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal n ...
following 2 and preceding 4, and is the smallest odd
prime number A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
and the only prime preceding a
square number In mathematics, a square number or perfect square is an integer that is the square (algebra), square of an integer; in other words, it is the multiplication, product of some integer with itself. For example, 9 is a square number, since it equals ...
. It has religious or cultural significance in many societies.


Evolution of the Arabic digit

The use of three lines to denote the number 3 occurred in many writing systems, including some (like Roman and Chinese numerals) that are still in use. That was also the original representation of 3 in the
Brahmic The Brahmic scripts, also known as Indic scripts, are a family of abugida writing systems. They are used throughout the Indian subcontinent, Southeast Asia and parts of East Asia. They are descended from the Brahmi script of ancient India ...
(Indian) numerical notation, its earliest forms aligned vertically. However, during the
Gupta Empire The Gupta Empire was an ancient Indian empire which existed from the early 4th century CE to late 6th century CE. At its zenith, from approximately 319 to 467 CE, it covered much of the Indian subcontinent. This period is considered as the Gol ...
the sign was modified by the addition of a curve on each line. The
Nāgarī script The Nāgarī script or Northern Nagari of Kashi is the ancestor of Devanagari, Nandinagari and other variants, and was first used to write Prakrit and Sanskrit. The term is sometimes used as a synonym for Devanagari script.Kathleen Kuiper (2010) ...
rotated the lines clockwise, so they appeared horizontally, and ended each line with a short downward stroke on the right. In cursive script, the three strokes were eventually connected to form a glyph resembling a with an additional stroke at the bottom: ३. The Indian digits spread to the
Caliphate A caliphate or khilāfah ( ar, خِلَافَة, ) is an institution or public office under the leadership of an Islamic steward with the title of caliph (; ar, خَلِيفَة , ), a person considered a political-religious successor to th ...
in the 9th century. The bottom stroke was dropped around the 10th century in the western parts of the Caliphate, such as the
Maghreb The Maghreb (; ar, الْمَغْرِب, al-Maghrib, lit=the west), also known as the Arab Maghreb ( ar, المغرب العربي) and Northwest Africa, is the western part of North Africa and the Arab world. The region includes Algeria, ...
and
Al-Andalus Al-Andalus DIN 31635, translit. ; an, al-Andalus; ast, al-Ándalus; eu, al-Andalus; ber, ⴰⵏⴷⴰⵍⵓⵙ, label=Berber languages, Berber, translit=Andalus; ca, al-Àndalus; gl, al-Andalus; oc, Al Andalús; pt, al-Ândalus; es, ...
, when a distinct variant ("Western Arabic") of the digit symbols developed, including modern Western 3. In contrast, the Eastern Arabs retained and enlarged that stroke, rotating the digit once more to yield the modern ("Eastern")
Arabic Arabic (, ' ; , ' or ) is a Semitic languages, Semitic language spoken primarily across the Arab world.Semitic languages: an international handbook / edited by Stefan Weninger; in collaboration with Geoffrey Khan, Michael P. Streck, Janet C ...
digit "٣". In most modern Western
typeface A typeface (or font family) is the design of lettering that can include variations in size, weight (e.g. bold), slope (e.g. italic), width (e.g. condensed), and so on. Each of these variations of the typeface is a font. There are list of type ...
s, the digit 3, like the other
decimal digit A numerical digit (often shortened to just digit) is a single symbol used alone (such as "2") or in combinations (such as "25"), to represent numbers in a positional numeral system. The name "digit" comes from the fact that the ten digits (Latin ...
s, has the height of a
capital letter Letter case is the distinction between the letters that are in larger uppercase or capitals (or more formally ''majuscule'') and smaller lowercase (or more formally ''minuscule'') in the written representation of certain languages. The writing ...
, and sits on the baseline. In typefaces with
text figures Text figures (also known as non-lining, lowercase, old style, ranging, hanging, medieval, billing, or antique figures or numerals) are numerals designed with varying heights in a fashion that resembles a typical line of running text, hence the ...
, on the other hand, the glyph usually has the height of a lowercase letter "x" and a
descender In typography and handwriting, a descender is the portion of a letter that extends below the baseline of a font. For example, in the letter ''y'', the descender is the "tail", or that portion of the diagonal line which lies below the ''v'' c ...
: "". In some
French French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with Franc ...
text-figure typefaces, though, it has an ascender instead of a descender. A common graphic variant of the digit three has a flat top, similar to the letter Ʒ (ezh). This form is sometimes used to prevent falsifying a 3 as an 8. It is found on
UPC-A The Universal Product Code (UPC or UPC code) is a barcode symbology that is widely used worldwide for tracking trade items in stores. UPC (technically refers to UPC-A) consists of 12 digits that are uniquely assigned to each trade item. Along w ...
barcodes and
standard 52-card deck The standard 52-card deck of French-suited playing cards is the most common pack of playing cards used today. In English-speaking countries it is the only traditional pack used for playing cards; in many countries of the world, however, it is used ...
s.


Mathematics

3 is the second smallest
prime number A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...
and the first
odd Odd means unpaired, occasional, strange or unusual, or a person who is viewed as eccentric. Odd may also refer to: Acronym * ODD (Text Encoding Initiative) ("One Document Does it all"), an abstracted literate-programming format for describing X ...
prime number. It is the first
unique prime The reciprocals of prime numbers have been of interest to mathematicians for various reasons. They do not have a finite sum, as Leonhard Euler proved in 1737. Like all rational numbers, the reciprocals of primes have repeating decimal represen ...
, such that the
period length A periodic function is a Function (mathematics), function that repeats its values at regular intervals. For example, the trigonometric functions, which repeat at intervals of 2\pi radians, are periodic functions. Periodic functions are used th ...
value of 1 of the
decimal expansion A decimal representation of a non-negative real number is its expression as a sequence of symbols consisting of decimal digits traditionally written with a single separator: r = b_k b_\ldots b_0.a_1a_2\ldots Here is the decimal separator, is ...
of its
reciprocal Reciprocal may refer to: In mathematics * Multiplicative inverse, in mathematics, the number 1/''x'', which multiplied by ''x'' gives the product 1, also known as a ''reciprocal'' * Reciprocal polynomial, a polynomial obtained from another pol ...
, 0.333..., is unique. 3 is a
twin prime A twin prime is a prime number that is either 2 less or 2 more than another prime number—for example, either member of the twin prime pair (41, 43). In other words, a twin prime is a prime that has a prime gap of two. Sometimes the term ''twin pr ...
with 5, and a
cousin prime In number theory, cousin primes are prime numbers that differ by four. Compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six. The cousin primes (sequences and in OE ...
with 7, and the only known number n such that n! - 1 and n! + 1 are prime, as well as the only prime number p such that p - 1 yields another prime number, 2. A
triangle A triangle is a polygon with three Edge (geometry), edges and three Vertex (geometry), vertices. It is one of the basic shapes in geometry. A triangle with vertices ''A'', ''B'', and ''C'' is denoted \triangle ABC. In Euclidean geometry, an ...
is made of three sides. It is the smallest non-self-intersecting
polygon In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed ''polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two toge ...
and the only polygon not to have proper
diagonals In geometry, a diagonal is a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge. Informally, any sloping line is called diagonal. The word ''diagonal'' derives from the ancient Greek δ ...
. When doing quick estimates, 3 is a rough approximation of , 3.1415..., and a very rough approximation of ''e'', 2.71828... 3 is the first
Mersenne prime In mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form for some integer . They are named after Marin Mersenne, a French Minim friar, who studied them in the early 17t ...
, as well as the second Mersenne prime exponent and the second double Mersenne prime exponent, for 7 and
127 127 may refer to: *127 (number), a natural number *AD 127, a year in the 2nd century AD *127 BC, a year in the 2nd century BC *127 (band), an Iranian band See also *List of highways numbered 127 Route 127 or Highway 127 can refer to multiple roads ...
, respectively. 3 is also the first of five known Fermat primes, which include 5, 17,
257 __NOTOC__ Year 257 ( CCLVII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerianus and Gallienus (or, less frequently, year 10 ...
, and
65537 65537 is the integer after 65536 and before 65538. In mathematics 65537 is the largest known prime number of the form 2^ +1 (n = 4). Therefore, a regular polygon with 65537 sides is constructible with compass and unmarked straightedge. Johann ...
. It is the second
Fibonacci prime A Fibonacci prime is a Fibonacci number that is prime, a type of integer sequence prime. The first Fibonacci primes are : : 2, 3, 5, 13, 89, 233, 1597, 28657, 514229, 433494437, 2971215073, .... Known Fibonacci primes It is not known whet ...
(and the second
Lucas prime The Lucas numbers or Lucas series are an integer sequence named after the mathematician Édouard Lucas, François Édouard Anatole Lucas (1842–1891), who studied both that sequence and the closely related Fibonacci numbers. Lucas numbers a ...
), the second Sophie Germain prime, and the second
factorial prime A factorial prime is a prime number that is one less or one more than a factorial (all factorials greater than 1 are even). The first 10 factorial primes (for ''n'' = 1, 2, 3, 4, 6, 7, 11, 12, 14) are : : 2 (0! +&n ...
, as it is equal to 2! + 1. 3 is the second and only prime
triangular number A triangular number or triangle number counts objects arranged in an equilateral triangle. Triangular numbers are a type of figurate number, other examples being square numbers and cube numbers. The th triangular number is the number of dots in ...
, and Gauss proved that every integer is the sum of at most 3 triangular numbers. 3 is the number of non-collinear points needed to determine a
plane Plane(s) most often refers to: * Aero- or airplane, a powered, fixed-wing aircraft * Plane (geometry), a flat, 2-dimensional surface Plane or planes may also refer to: Biology * Plane (tree) or ''Platanus'', wetland native plant * Planes (gen ...
and a
circle A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. Equivalently, it is the curve traced out by a point that moves in a plane so that its distance from a given point is const ...
. Three is the only prime which is one less than a
perfect square ''Perfect Square'' is a 2004 concert film of the alternative rock Musical ensemble, band R.E.M. (band), R.E.M., filmed on July 19, 2003, at the bowling green, Bowling Green in Wiesbaden, Germany. It was released by Warner Reprise Video on March 9, ...
. Any other number which is n^2 − 1 for some integer n is not prime, since it is (n − 1)(n + 1). This is true for 3 as well (with n = 2), but in this case the smaller factor is 1. If n is greater than 2, both n − 1 and n + 1 are greater than 1 so their product is not prime. A
natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal n ...
is divisible by three if the sum of its digits in base 10 is divisible by 3. For example, the number 21 is divisible by three (3 times 7) and the sum of its digits is 2 + 1 = 3. Because of this, the reverse of any number that is divisible by three (or indeed, any
permutation In mathematics, a permutation of a set is, loosely speaking, an arrangement of its members into a sequence or linear order, or if the set is already ordered, a rearrangement of its elements. The word "permutation" also refers to the act or proc ...
of its digits) is also divisible by three. For instance, 1368 and its reverse 8631 are both divisible by three (and so are 1386, 3168, 3186, 3618, etc.). See also
Divisibility rule A divisibility rule is a shorthand and useful way of determining whether a given integer is divisible by a fixed divisor without performing the division, usually by examining its digits. Although there are divisibility tests for numbers in any rad ...
. This works in base 10 and in any positional numeral system whose base divided by three leaves a remainder of one (bases 4, 7, 10, etc.). Three of the five Platonic solids have triangular faces – the
tetrahedron In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the o ...
, the octahedron, and the
icosahedron In geometry, an icosahedron ( or ) is a polyhedron with 20 faces. The name comes and . The plural can be either "icosahedra" () or "icosahedrons". There are infinitely many non- similar shapes of icosahedra, some of them being more symmetrica ...
. Also, three of the five Platonic solids have vertices where three faces meet – the
tetrahedron In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the o ...
, the hexahedron (
cube In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. Viewed from a corner it is a hexagon and its net is usually depicted as a cross. The cube is the only r ...
), and the dodecahedron. Furthermore, only three different types of
polygons In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed ''polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two toge ...
comprise the faces of the five Platonic solids – the
triangle A triangle is a polygon with three Edge (geometry), edges and three Vertex (geometry), vertices. It is one of the basic shapes in geometry. A triangle with vertices ''A'', ''B'', and ''C'' is denoted \triangle ABC. In Euclidean geometry, an ...
, the square, and the
pentagon In geometry, a pentagon (from the Greek πέντε ''pente'' meaning ''five'' and γωνία ''gonia'' meaning ''angle'') is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°. A pentagon may be simpl ...
. There are only three distinct 4×4
panmagic square A pandiagonal magic square or panmagic square (also diabolic square, diabolical square or diabolical magic square) is a magic square with the additional property that the broken diagonals, i.e. the diagonals that wrap round at the edges of the squar ...
s. According to
Pythagoras Pythagoras of Samos ( grc, Πυθαγόρας ὁ Σάμιος, Pythagóras ho Sámios, Pythagoras the Samos, Samian, or simply ; in Ionian Greek; ) was an ancient Ionians, Ionian Ancient Greek philosophy, Greek philosopher and the eponymou ...
and the Pythagorean school, the number 3, which they called ''triad'', is the noblest of all digits, as it is the only number to equal the sum of all the terms below it, and the only number whose sum with those below equals the product of them and itself. There are three finite convex uniform polytope groups in three dimensions, aside from the infinite families of prisms and antiprisms: the
tetrahedral group 150px, A regular tetrahedron, an example of a solid with full tetrahedral symmetry A regular tetrahedron has 12 rotational (or orientation-preserving) symmetries, and a symmetry order of 24 including transformations that combine a reflection a ...
, the
octahedral group A regular octahedron has 24 rotational (or orientation-preserving) symmetries, and 48 symmetries altogether. These include transformations that combine a reflection and a rotation. A cube has the same set of symmetries, since it is the polyhedr ...
, and the icosahedral group. In dimensions n ⩾ 5, there are only three regular polytopes: the n-
simplex In geometry, a simplex (plural: simplexes or simplices) is a generalization of the notion of a triangle or tetrahedron to arbitrary dimensions. The simplex is so-named because it represents the simplest possible polytope in any given dimension. ...
es, n-
cube In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. Viewed from a corner it is a hexagon and its net is usually depicted as a cross. The cube is the only r ...
s, and n- orthoplexes. In dimensions n9, the only three uniform polytope families, aside from the numerous infinite proprismatic families, are the \mathrm_ simplex, \mathrm_ cubic, and \mathrm_ demihypercubic families. For paracompact hyperbolic honeycombs, there are three groups in
dimension In physics and mathematics, the dimension of a Space (mathematics), mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any Point (geometry), point within it. Thus, a Line (geometry), lin ...
s 6 and 9, or equivalently of ranks 7 and 10, with no other forms in higher dimensions. Of the final three groups, the largest and most important is _9, that is associated with an important Kac–Moody
Lie algebra In mathematics, a Lie algebra (pronounced ) is a vector space \mathfrak g together with an Binary operation, operation called the Lie bracket, an Alternating multilinear map, alternating bilinear map \mathfrak g \times \mathfrak g \rightarrow ...
\mathrm _. The
trisection of the angle Angle trisection is a classical problem of straightedge and compass construction of ancient Greek mathematics. It concerns construction of an angle equal to one third of a given arbitrary angle, using only two tools: an unmarked straightedge an ...
was one of the three famous problems of antiquity.


Numeral systems

There is some evidence to suggest that early man may have used counting systems which consisted of "One, Two, Three" and thereafter "Many" to describe counting limits. Early peoples had a word to describe the quantities of one, two, and three but any quantity beyond was simply denoted as "Many". This is most likely based on the prevalence of this phenomenon among people in such disparate regions as the deep Amazon and Borneo jungles, where western civilization's explorers have historical records of their first encounters with these indigenous people.


List of basic calculations


Science

*The Roman numeral III stands for giant star in the
Yerkes spectral classification scheme In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grati ...
. *Three is the
atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of every ...
of
lithium Lithium (from el, λίθος, lithos, lit=stone) is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid el ...
. *Three is the
ASCII ASCII ( ), abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Because of ...
code of " End of Text". *Three is the number of dimensions that humans can perceive. Humans perceive the
universe The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. The Big Bang theory is the prevailing cosmological description of the development of the universe. Acc ...
to have three spatial dimensions, but some theories, such as
string theory In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interac ...
, suggest there are more. *Three is the number of elementary fermion
generations A generation is "all of the people born and living at about the same time, regarded collectively." Generation or generations may also refer to: Science and technology * Generation (particle physics), a division of the elementary particles * Gen ...
according to the
Standard Model The Standard Model of particle physics is the theory describing three of the four known fundamental forces (electromagnetism, electromagnetic, weak interaction, weak and strong interactions - excluding gravity) in the universe and classifying a ...
of particle physics. *The
triangle A triangle is a polygon with three Edge (geometry), edges and three Vertex (geometry), vertices. It is one of the basic shapes in geometry. A triangle with vertices ''A'', ''B'', and ''C'' is denoted \triangle ABC. In Euclidean geometry, an ...
, a
polygon In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed ''polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two toge ...
with three
edges Edge or EDGE may refer to: Technology Computing * Edge computing, a network load-balancing system * Edge device, an entry point to a computer network * Adobe Edge, a graphical development application * Microsoft Edge, a web browser developed by ...
and three vertices, is the most stable physical shape. For this reason it is widely utilized in construction, engineering and design. *The ability of the
human eye The human eye is a sensory organ, part of the sensory nervous system, that reacts to visible light and allows humans to use visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm. ...
to distinguish
color Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associ ...
s is based upon the varying sensitivity of different cells in the
retina The retina (from la, rete "net") is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs. The optics of the eye create a focused two-dimensional image of the visual world on the retina, which then ...
to light of different wavelengths. Humans being trichromatic, the retina contains three types of color receptor cells, or cones. *There are three primary colors in the
additive Additive may refer to: Mathematics * Additive function, a function in number theory * Additive map, a function that preserves the addition operation * Additive set-functionn see Sigma additivity * Additive category, a preadditive category with f ...
and subtractive models.


Protoscience

*In European
alchemy Alchemy (from Arabic: ''al-kīmiyā''; from Ancient Greek: χυμεία, ''khumeía'') is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practiced in China, India, the Muslim world, ...
, the three primes ( la, tria prima) were
salt Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. Salt is present in vast quantitie ...
(),
sulfur Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula ...
() and
mercury Mercury commonly refers to: * Mercury (planet), the nearest planet to the Sun * Mercury (element), a metallic chemical element with the symbol Hg * Mercury (mythology), a Roman god Mercury or The Mercury may also refer to: Companies * Merc ...
().Eric John Holmyard. ''Alchemy.'' 1995. p.153 *The three
doshas ''Dosha'' ( sa, दोषः, IAST: ''doṣa'') is a central term in Ayurveda originating from Sanskrit, which can be translated as "that which can cause problems" (literally meaning "fault" or "defect"), and which refers to three categories or ...
(weaknesses) and their antidotes are the basis of
Ayurvedic medicine Ayurveda () is an alternative medicine system with historical roots in the Indian subcontinent. The theory and practice of Ayurveda is pseudoscientific. Ayurveda is heavily practiced in India and Nepal, where around 80% of the population repor ...
in India.


Pseudoscience

*Three is the symbolic representation for Mu,
Augustus Le Plongeon Augustus Henry Julian Le Plongeon (4 May 1825 – 13 December 1908) was a British-American archeologist and photographer who studied the pre-Columbian ruins of America, particularly those of the Maya civilization on the northern Yucatán Penins ...
's and James Churchward's lost continent. *In Pythagorean
numerology Numerology (also known as arithmancy) is the belief in an occult, divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value, via an alphanumeric system, of the letters in ...
the number 3 is the digit that represents the communication. It encourages the expansion of creativity, sociability between people and movement. For Pythagoras, the number 3 was a perfect number, representing harmony, perfection, and divine proportion.


Philosophy

*Philosophers such as
Aquinas Thomas Aquinas, OP (; it, Tommaso d'Aquino, lit=Thomas of Aquino; 1225 – 7 March 1274) was an Italian Dominican friar and priest who was an influential philosopher, theologian and jurist in the tradition of scholasticism; he is known wit ...
, Kant,
Hegel Georg Wilhelm Friedrich Hegel (; ; 27 August 1770 – 14 November 1831) was a German philosopher. He is one of the most important figures in German idealism and one of the founding figures of modern Western philosophy. His influence extends a ...
, C. S. Peirce, and
Karl Popper Sir Karl Raimund Popper (28 July 1902 – 17 September 1994) was an Austrian-British philosopher, academic and social commentator. One of the 20th century's most influential philosophers of science, Popper is known for his rejection of the cl ...
have made threefold divisions, or '' trichotomies'', which have been important in their work. *
Hegel Georg Wilhelm Friedrich Hegel (; ; 27 August 1770 – 14 November 1831) was a German philosopher. He is one of the most important figures in German idealism and one of the founding figures of modern Western philosophy. His influence extends a ...
's
dialectic Dialectic ( grc-gre, διαλεκτική, ''dialektikḗ''; related to dialogue; german: Dialektik), also known as the dialectical method, is a discourse between two or more people holding different points of view about a subject but wishing ...
of Thesis + Antithesis = Synthesis creates three-ness from two-ness.


Religion

Many world religions contain triple deities or concepts of trinity, including: *The
Hindu Hindus (; ) are people who religiously adhere to Hinduism.Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pages 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for ...
Trimurti The Trimūrti (; Sanskrit: त्रिमूर्ति ', "three forms" or "trinity") are the trinity of supreme divinity in Hinduism, in which the cosmic functions of creation, maintenance, and destruction are personified as a triad of de ...
*The Hindu
Tridevi The Tridevi () are a trinity of supreme divinity in Hinduism, joining a triad of eminent goddesses either as a feminine version of the Trimurti, or as consorts of a masculine Trimurti, depending on the denomination. This triad is typically pers ...
*The
Three Jewels In Buddhism, refuge or taking refuge refers to a religious practice, which often includes a prayer or recitation performed at the beginning of the day or of a practice session. Since the period of Early Buddhism until present time, all Theravada ...
of
Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and gra ...
*The
Three Pure Ones The Three Pure Ones (), also translated as the Three Pure Pellucid Ones, the Three Pristine Ones, the Three Divine Teachers, the Three Clarities, or the Three Purities, are the three highest gods in the Taoist pantheon. They are regarded as pure ...
of
Taoism Taoism (, ) or Daoism () refers to either a school of Philosophy, philosophical thought (道家; ''daojia'') or to a religion (道教; ''daojiao''), both of which share ideas and concepts of China, Chinese origin and emphasize living in harmo ...
*The
Christian Christians () are people who follow or adhere to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. The words ''Christ'' and ''Christian'' derive from the Koine Greek title ''Christós'' (Χρι ...
Holy Trinity The Christian doctrine of the Trinity (, from 'threefold') is the central dogma concerning the nature of God in most Christian churches, which defines one God existing in three coequal, coeternal, consubstantial divine persons: God the F ...
*The
Triple Goddess A triple deity is a deity with three apparent forms that function as a singular whole. Such deities may sometimes be referred to as threefold, tripled, triplicate, tripartite, triune, triadic, or as a trinity. The number three has a long history ...
of
Wicca Wicca () is a modern Pagan religion. Scholars of religion categorise it as both a new religious movement and as part of the occultist stream of Western esotericism. It was developed in England during the first half of the 20th century and was ...


Christianity

*The
threefold office The threefold office ( la, munus triplex) of Jesus Christ is a Christian doctrine based upon the teachings of the Old Testament of which Christians hold different views. It was described by Eusebius and more fully developed by John Calvin. The ...
of
Christ Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other Names and titles of Jesus in the New Testament, names and titles), was ...
is a Christian doctrine which states that Christ performs the functions of
prophet In religion, a prophet or prophetess is an individual who is regarded as being in contact with a divine being and is said to speak on behalf of that being, serving as an intermediary with humanity by delivering messages or teachings from the s ...
,
priest A priest is a religious leader authorized to perform the sacred rituals of a religion, especially as a mediatory agent between humans and one or more deities. They also have the authority or power to administer religious rites; in particu ...
, and
king King is the title given to a male monarch in a variety of contexts. The female equivalent is queen, which title is also given to the consort of a king. *In the context of prehistory, antiquity and contemporary indigenous peoples, the tit ...
. *The
ministry of Jesus The ministry of Jesus, in the canonical gospels, begins with his baptism in the countryside of Roman Judea and Transjordan, near the River Jordan by John the Baptist, and ends in Jerusalem, following the Last Supper with his disciples.''Chri ...
lasted approximately three years. *During the Agony in the Garden, Christ asked three times for the cup to be taken from him. *Jesus rose from the dead on the third day after his death. *The devil tempted Jesus three times. *
Saint Peter Saint Peter; he, שמעון בר יונה, Šimʿōn bar Yōnāh; ar, سِمعَان بُطرُس, translit=Simʿa̅n Buṭrus; grc-gre, Πέτρος, Petros; cop, Ⲡⲉⲧⲣⲟⲥ, Petros; lat, Petrus; ar, شمعون الصفـا, Sham'un ...
thrice denied Jesus and thrice affirmed his faith in Jesus. *The
Magi Magi (; singular magus ; from Latin ''magus'', cf. fa, مغ ) were priests in Zoroastrianism and the earlier religions of the western Iranians. The earliest known use of the word ''magi'' is in the trilingual inscription written by Darius th ...
– wise men who were astronomers/astrologers from Persia – gave Jesus three gifts. *There are three
Synoptic Gospels The gospels of Gospel of Matthew, Matthew, Gospel of Mark, Mark, and Gospel of Luke, Luke are referred to as the synoptic Gospels because they include many of the same stories, often in a similar sequence and in similar or sometimes identical ...
and three epistles of John. *
Paul the Apostle Paul; grc, Παῦλος, translit=Paulos; cop, ⲡⲁⲩⲗⲟⲥ; hbo, פאולוס השליח (previously called Saul of Tarsus;; ar, بولس الطرسوسي; grc, Σαῦλος Ταρσεύς, Saũlos Tarseús; tr, Tarsuslu Pavlus; ...
went blind for three days after his
conversion to Christianity Conversion to Christianity is the religious conversion of a previously non-Christian person to Christianity. Different Christian denominations may perform various different kinds of rituals or ceremonies initiation into their community of believ ...
.


Judaism

*
Noah Noah ''Nukh''; am, ኖህ, ''Noḥ''; ar, نُوح '; grc, Νῶε ''Nôe'' () is the tenth and last of the pre-Flood patriarchs in the traditions of Abrahamic religions. His story appears in the Hebrew Bible (Book of Genesis, chapters 5– ...
had three sons: Ham, Shem and
Japheth Japheth ( he, יֶפֶת ''Yép̄eṯ'', in pausa ''Yā́p̄eṯ''; el, Ἰάφεθ '; la, Iafeth, Iapheth, Iaphethus, Iapetus) is one of the three sons of Noah in the Book of Genesis, in which he plays a role in the story of Noah's drunk ...
*The Three Patriarchs:
Abraham Abraham, ; ar, , , name=, group= (originally Abram) is the common Hebrew patriarch of the Abrahamic religions, including Judaism, Christianity, and Islam. In Judaism, he is the founding father of the special relationship between the Jew ...
,
Isaac Isaac; grc, Ἰσαάκ, Isaák; ar, إسحٰق/إسحاق, Isḥāq; am, ይስሐቅ is one of the three patriarchs of the Israelites and an important figure in the Abrahamic religions, including Judaism, Christianity, and Islam. He was the ...
and
Jacob Jacob (; ; ar, يَعْقُوب, Yaʿqūb; gr, Ἰακώβ, Iakṓb), later given the name Israel, is regarded as a patriarch of the Israelites and is an important figure in Abrahamic religions, such as Judaism, Christianity, and Islam. J ...
*The prophet
Balaam Balaam (; , Standard ''Bīlʿam'' Tiberian ''Bīlʿām'') is a diviner in the Torah (Pentateuch) whose story begins in Chapter 22 of the Book of Numbers (). Ancient references to Balaam consider him a non-Israelite, a prophet, and the son of Beo ...
beat his donkey three times. *The prophet Jonah spent three days and nights in the belly of a large fish *Three divisions of the Written
Torah The Torah (; hbo, ''Tōrā'', "Instruction", "Teaching" or "Law") is the compilation of the first five books of the Hebrew Bible, namely the books of Genesis, Exodus, Leviticus, Numbers and Deuteronomy. In that sense, Torah means the s ...
:
Torah The Torah (; hbo, ''Tōrā'', "Instruction", "Teaching" or "Law") is the compilation of the first five books of the Hebrew Bible, namely the books of Genesis, Exodus, Leviticus, Numbers and Deuteronomy. In that sense, Torah means the s ...
(Five Books of Moses),
Nevi'im Nevi'im (; he, נְבִיאִים ''Nəvīʾīm'', Tiberian: ''Năḇīʾīm,'' "Prophets", literally "spokespersons") is the second major division of the Hebrew Bible (the ''Tanakh''), lying between the Torah (instruction) and Ketuvim (wri ...
(Prophets),
Ketuvim The Ketuvim (; hbo, , Modern: ''Kəṯūvīm'', Tiberian: ''Kăṯūḇīm'' "writings") is the third and final section of the Tanakh (Hebrew Bible), after Torah (instruction) and Nevi'im (prophets). In English translations of the Hebrew Bi ...
(Writings) *Three divisions of the Jewish people:
Kohen Kohen ( he, , ''kōhēn'', , "priest", pl. , ''kōhănīm'', , "priests") is the Hebrew word for "priest", used in reference to the Aaronic priesthood, also called Aaronites or Aaronides. Levitical priests or ''kohanim'' are traditionally b ...
,
Levite Levites (or Levi) (, he, ''Lǝvīyyīm'') are Jewish males who claim patrilineal descent from the Tribe of Levi. The Tribe of Levi descended from Levi, the third son of Jacob and Leah. The surname ''Halevi'', which consists of the Hebrew defi ...
, Yisrael *Three daily
prayers Prayer is an invocation or act that seeks to activate a rapport with an object of worship through deliberate communication. In the narrow sense, the term refers to an act of supplication or intercession directed towards a deity or a deified an ...
: ''
Shacharit ''Shacharit'' ( he, שַחֲרִית ''šaḥăriṯ''), or ''Shacharis'' in Ashkenazi Hebrew, is the morning ''tefillah'' (prayer) of Judaism, one of the three daily prayers. Different traditions identify different primary components of ...
'', '' Mincha'', '' Maariv'' *Three
Shabbat Shabbat (, , or ; he, שַׁבָּת, Šabbāṯ, , ) or the Sabbath (), also called Shabbos (, ) by Ashkenazim, is Judaism's day of rest on the seventh day of the week—i.e., Saturday. On this day, religious Jews remember the biblical storie ...
meals *Shabbat ends when three stars are visible in the night sky *
Three Pilgrimage Festivals The Three Pilgrimage Festivals, in Hebrew ''Shalosh Regalim'' (שלוש רגלים), are three major festivals in Judaism—Pesach (''Passover''), Shavuot (''Weeks'' or ''Pentecost''), and Sukkot (''Tabernacles'', ''Tents'' or ''Booths'')—when a ...
:
Passover Passover, also called Pesach (; ), is a major Jewish holidays, Jewish holiday that celebrates the The Exodus, Biblical story of the Israelites escape from slavery in Ancient Egypt, Egypt, which occurs on the 15th day of the Hebrew calendar, He ...
,
Shavuot (''Ḥag HaShavuot'' or ''Shavuos'') , nickname = English: "Feast of Weeks" , observedby = Jews and Samaritans , type = Jewish and Samaritan , begins = 6th day of Sivan (or the Sunday following the 6th day of Sivan i ...
,
Sukkot or ("Booths, Tabernacles") , observedby = Jews, Samaritans, a few Protestant denominations, Messianic Jews, Semitic Neopagans , type = Jewish, Samaritan , begins = 15th day of Tishrei , ends = 21st day of Tishre ...
*Three
matzo Matzah or matzo ( he, מַצָּה, translit=maṣṣā'','' pl. matzot or Ashk. matzos) is an unleavened flatbread that is part of Jewish cuisine and forms an integral element of the Passover festival, during which '' chametz'' (leaven and ...
s on the
Passover Seder The Passover Seder (; he, סדר פסח , 'Passover order/arrangement'; yi, סדר ) is a ritual feast at the beginning of the Jewish holiday of Passover. It is conducted throughout the world on the eve of the 15th day of Nisan in the Hebrew c ...
table * The Three Weeks, a period of mourning bridging the fast days of Seventeenth of Tammuz and
Tisha B'Av Tisha B'Av ( he, תִּשְׁעָה בְּאָב ''Tīšʿā Bəʾāv''; , ) is an annual fast day in Judaism, on which a number of disasters in Jewish history occurred, primarily the destruction of both Solomon's Temple by the Neo-Babylonian E ...
*Three cardinal sins for which a Jew must die rather than transgress:
idolatry Idolatry is the worship of a cult image or "idol" as though it were God. In Abrahamic religions (namely Judaism, Samaritanism, Christianity, the Baháʼí Faith, and Islam) idolatry connotes the worship of something or someone other than the A ...
,
murder Murder is the unlawful killing of another human without justification (jurisprudence), justification or valid excuse (legal), excuse, especially the unlawful killing of another human with malice aforethought. ("The killing of another person wit ...
,
sexual immorality Immorality is the violation of moral laws, norms or standards. It refers to an agent doing or thinking something they know or believe to be wrong. Immorality is normally applied to people or actions, or in a broader sense, it can be applied to gr ...
*
Upsherin Upsherin, Upsheren, Opsherin or Upsherinish (Yiddish: אפשערן, lit. "shear off", Judaeo-Arabic: חלאקה, ''ḥalāqah'') is a haircutting ceremony observed by a wide cross-section of Jews and is particularly popular in Haredi Jewish c ...
, a Jewish boy's first haircut at age 3 *A
Beth din A beit din ( he, בית דין, Bet Din, house of judgment, , Ashkenazic: ''beis din'', plural: batei din) is a rabbinical court of Judaism. In ancient times, it was the building block of the legal system in the Biblical Land of Israel. Today, it ...
is composed of three members *Potential
converts Religious conversion is the adoption of a set of beliefs identified with one particular religious denomination to the exclusion of others. Thus "religious conversion" would describe the abandoning of adherence to one denomination and affiliatin ...
are traditionally turned away three times to test their sincerity *In the
Jewish mystical Academic study of Jewish mysticism, especially since Gershom Scholem's ''Major Trends in Jewish Mysticism'' (1941), distinguishes between different forms of mysticism across different eras of Jewish history. Of these, Kabbalah, which emerged in 1 ...
tradition of the
Kabbalah Kabbalah ( he, קַבָּלָה ''Qabbālā'', literally "reception, tradition") is an esoteric method, discipline and Jewish theology, school of thought in Jewish mysticism. A traditional Kabbalist is called a Mekubbal ( ''Məqūbbāl'' "rece ...
, it is believed that
the soul In many religious and philosophical traditions, there is a belief that a soul is "the immaterial aspect or essence of a human being". Etymology The Modern English noun ''soul'' is derived from Old English ''sāwol, sāwel''. The earliest attes ...
consists of three parts, with the highest being ''
neshamah ''Neshamah (Songs from the Jewish Diaspora)'' is the first solo recording by American guitarist Tim Sparks on the Tzadik Records label. "Neshamah" means "soul" in Hebrew. The arrangements adapt Ashkenazic klezmer, Sephardic and Middle Eastern Jew ...
'' ("breath"), the middle being '' ruach'' ("wind" or "spirit") and the lowest being ''
nefesh A nefesh (plural: ''nefashot'') is a Semitic monument placed near a grave so as to be seen from afar. Nabataea In a Nabataean votive inscription from Salkhad, an Aramaic heap of stones set up in memorial is described as "for Allat and her ''w ...
'' ("repose"). Sometimes the two elements of ''Chayah'' ("life" or "animal") and ''Yechidah'' ("unit") are additionally mentioned. *In the Kabbalah, the
Tree of Life The tree of life is a fundamental archetype in many of the world's mythological, religious, and philosophical traditions. It is closely related to the concept of the sacred tree.Giovino, Mariana (2007). ''The Assyrian Sacred Tree: A History ...
(Hebrew: ''Etz ha-Chayim'', עץ החיים) refers to a latter 3-pillar diagrammatic representation of its central mystical symbol, known as the '' 10 Sephirot''.


Islam

*The three core principles in Shia tradition: Tawhid (Oneness of God), Nabuwwa (Concept of Prophethood), Imama (Concept of Imam)


Buddhism

*The Triple
Bodhi The English term enlightenment is the Western translation of various Buddhist terms, most notably bodhi and vimutti. The abstract noun ''bodhi'' (; Sanskrit: बोधि; Pali: ''bodhi''), means the knowledge or wisdom, or awakened intellect ...
(ways to understand the end of birth) are Budhu, Pasebudhu, and Mahaarahath. *The
Three Jewels In Buddhism, refuge or taking refuge refers to a religious practice, which often includes a prayer or recitation performed at the beginning of the day or of a practice session. Since the period of Early Buddhism until present time, all Theravada ...
, the three things that Buddhists take refuge in.


Shinto

*The
Imperial Regalia of Japan The are the imperial regalia of Japan and consist of the sword , the mirror , and the jewel . They represent the three primary virtues: valour (the sword), wisdom (the mirror), and benevolence (the jewel).
of the sword, mirror, and jewel.


Daoism

*The Three Treasures (), the basic
virtues Virtue ( la, virtus) is moral excellence. A virtue is a trait or quality that is deemed to be morally good and thus is valued as a foundation of principle and good moral being. In other words, it is a behavior that shows high moral standard ...
in
Taoism Taoism (, ) or Daoism () refers to either a school of Philosophy, philosophical thought (道家; ''daojia'') or to a religion (道教; ''daojiao''), both of which share ideas and concepts of China, Chinese origin and emphasize living in harmo ...
. *The Three Dantians *Three Lines of a
Trigram Trigrams are a special case of the ''n''-gram, where ''n'' is 3. They are often used in natural language processing for performing statistical analysis of texts and in cryptography for control and use of ciphers and codes. Frequency Context is ...
*
Three Sovereigns The Three Sovereigns and Five Emperors were two groups of mythological rulers in ancient north China. The Three Sovereigns supposedly lived long before The Five Emperors, who have been assigned dates in a period from 3162 BC to 2070 BC. Today ...
: Heaven Fu Xi (Hand – Head – 3º Eye), Humanity
Shen Nong Shennong (), variously translated as "Divine Farmer" or "Divine Husbandman", born Jiang Shinian (), was a mythological Chinese ruler known as the first Yan Emperor who has become a deity in Chinese and Vietnamese folk religion. He is venerat ...
( Unit 69), Hell
Nüwa Nüwa, also read Nügua, is the mother goddess of Chinese mythology. She is credited with creating humanity and repairing the Pillar of Heaven. As creator of mankind, she molded humans individually by hand with yellow clay. In the Huainanzi ...
(Foot – Abdomen – Umbiculus).


Hinduism

*The
Trimurti The Trimūrti (; Sanskrit: त्रिमूर्ति ', "three forms" or "trinity") are the trinity of supreme divinity in Hinduism, in which the cosmic functions of creation, maintenance, and destruction are personified as a triad of de ...
:
Brahma Brahma ( sa, ब्रह्मा, Brahmā) is a Hindu god, referred to as "the Creator" within the Trimurti, the trinity of supreme divinity that includes Vishnu, and Shiva.Jan Gonda (1969)The Hindu Trinity Anthropos, Bd 63/64, H 1/2, pp. 21 ...
the Creator,
Vishnu Vishnu ( ; , ), also known as Narayana and Hari, is one of the principal deities of Hinduism. He is the supreme being within Vaishnavism, one of the major traditions within contemporary Hinduism. Vishnu is known as "The Preserver" within t ...
the Preserver, and
Shiva Shiva (; sa, शिव, lit=The Auspicious One, Śiva ), also known as Mahadeva (; ɐɦaːd̪eːʋɐ, or Hara, is one of the principal deities of Hinduism. He is the Supreme Being in Shaivism, one of the major traditions within Hindu ...
the Destroyer. *The three Gunas found in
Samkhya ''Samkhya'' or ''Sankya'' (; Sanskrit सांख्य), IAST: ') is a Dualism (Indian philosophy), dualistic Āstika and nāstika, school of Indian philosophy. It views reality as composed of two independent principles, ''purusha, puruṣa' ...
school of Hindu philosophy. *The three paths to salvation in the ''
Bhagavad Gita The Bhagavad Gita (; sa, श्रीमद्भगवद्गीता, lit=The Song by God, translit=śrīmadbhagavadgītā;), often referred to as the Gita (), is a 700- verse Hindu scripture that is part of the epic ''Mahabharata'' (c ...
'' named
Karma Yoga Karma yoga ( sa, कर्म योग), also called Karma marga, is one of the four classical spiritual paths in Hinduism, one based on the "yoga of action", the others being Jnana yoga (path of knowledge), Rāja yoga (path of meditatio ...
,
Bhakti Yoga Bhakti yoga ( sa, भक्ति योग), also called Bhakti marga (, literally the path of ''Bhakti''), is a spiritual path or spiritual practice within Hinduism focused on loving devotion towards any personal deity.Karen Pechelis (2014), ...
and
Jnana Yoga Jnana yoga (), also known as the jnana ''marga'' (), is one of the three classical paths ('' margas'') for moksha (liberation) in Hinduism, which emphasizes the "path of knowledge", also known as the "path of self-realization". The other two ...
.


Zoroastrianism

*The three virtues of ''Humata'', ''Hukhta'' and ''Huvarshta'' (Good Thoughts, Good Words and Good Deeds) are a basic tenet in
Zoroastrianism Zoroastrianism is an Iranian religions, Iranian religion and one of the world's History of religion, oldest organized faiths, based on the teachings of the Iranian peoples, Iranian-speaking prophet Zoroaster. It has a Dualism in cosmology, du ...
.


Norse mythology

Three is a very significant number in
Norse mythology Norse, Nordic, or Scandinavian mythology is the body of myths belonging to the North Germanic peoples, stemming from Old Norse religion and continuing after the Christianization of Scandinavia, and into the Nordic folklore of the modern period ...
, along with its powers 9 and 27. *Prior to
Ragnarök In Norse mythology, (; non, Ragnarǫk) is a series of events, including a great battle, foretelling the death of numerous great figures (including the gods Odin, Thor, Týr, Freyr, Heimdallr, and Loki), natural disasters, and the submers ...
, there will be three hard winters without an intervening summer, the
Fimbulwinter In Norse mythology, (commonly rendered in English as Fimbulwinter), is the immediate prelude to the events of Ragnarök. It means 'great winter'. Summary is the harsh winter that precedes the end of the world and puts an end to all life on E ...
. *Odin endured three hardships upon the World Tree in his quest for the
runes Runes are the letter (alphabet), letters in a set of related alphabets known as runic alphabets native to the Germanic peoples. Runes were used to write various Germanic languages (with some exceptions) before they adopted the Latin alphabet, a ...
: he hanged himself, wounded himself with a spear, and suffered from hunger and thirst. * Bor had three sons,
Odin Odin (; from non, Óðinn, ) is a widely revered Æsir, god in Germanic paganism. Norse mythology, the source of most surviving information about him, associates him with wisdom, healing, death, royalty, the gallows, knowledge, war, battle, v ...
, Vili, and .


Other religions

*The
Wicca Wicca () is a modern Pagan religion. Scholars of religion categorise it as both a new religious movement and as part of the occultist stream of Western esotericism. It was developed in England during the first half of the 20th century and was ...
n
Rule of Three Rule of three or Rule of Thirds may refer to: Science and technology *Rule of three (aeronautics), a rule of descent in aviation *Rule of three (C++ programming), a rule of thumb about class method definitions * Rule of three (computer programming ...
. *The
Triple Goddess A triple deity is a deity with three apparent forms that function as a singular whole. Such deities may sometimes be referred to as threefold, tripled, triplicate, tripartite, triune, triadic, or as a trinity. The number three has a long history ...
: Maiden, Mother, Crone; the three fates. *The sons of
Cronus In Ancient Greek religion and mythology, Cronus, Cronos, or Kronos ( or , from el, Κρόνος, ''Krónos'') was the leader and youngest of the first generation of Titans, the divine descendants of the primordial Gaia (Mother Earth) and ...
:
Zeus Zeus or , , ; grc, Δῐός, ''Diós'', label=Genitive case, genitive Aeolic Greek, Boeotian Aeolic and Doric Greek#Laconian, Laconian grc-dor, Δεύς, Deús ; grc, Δέος, ''Déos'', label=Genitive case, genitive el, Δίας, ''D ...
,
Poseidon Poseidon (; grc-gre, Ποσειδῶν) was one of the Twelve Olympians in ancient Greek religion and myth, god of the sea, storms, earthquakes and horses.Burkert 1985pp. 136–139 In pre-Olympian Bronze Age Greece, he was venerated as a ch ...
, and
Hades Hades (; grc-gre, ᾍδης, Háidēs; ), in the ancient Greek religion and myth, is the god of the dead and the king of the underworld, with which his name became synonymous. Hades was the eldest son of Cronus and Rhea, although this also ...
. *The Slavic god
Triglav Triglav (; german: Terglau; it, Tricorno), with an elevation of , is the highest mountain in Slovenia and the highest peak of the Julian Alps. The mountain is the pre-eminent symbol of the Slovene nation. It is the centrepiece of Triglav Natio ...
has three heads.


Esoteric tradition

*The
Theosophical Society The Theosophical Society, founded in 1875, is a worldwide body with the aim to advance the ideas of Theosophy in continuation of previous Theosophists, especially the Greek and Alexandrian Neo-Platonic philosophers dating back to 3rd century CE ...
has three conditions of membership. * Gurdjieff's Three Centers and the Law of Three. *''
Liber AL vel Legis ''Liber AL vel Legis'' (), commonly known as ''The Book of the Law'', is the central sacred text of Thelema. Aleister Crowley said that it was dictated to him by a beyond-human being who called himself 'Aiwass'. Rose Edith Kelly, Crowley's w ...
'', the central scripture of the religion of Thelema, consists of three chapters, corresponding to three divine narrators respectively:
Nuit Nuit (alternatively Nu, Nut, or Nuith) is a goddess in Thelema, the speaker in the first Chapter of ''The Book of the Law'', the sacred text written or received in 1904 by Aleister Crowley. Based on the Ancient Egyptian sky goddess Nut, who ...
, Hadit and
Ra-Hoor-Khuit Heru-ra-ha () is a composite deity within Thelema, a religion that began in 1904 with Aleister Crowley and his ''Book of the Law''. Heru-ra-ha is composed of Ra-Hoor-Khuit and Hoor-paar-kraat. He is associated with the other two major Thelemic ...
. *The Triple Greatness of
Hermes Trismegistus Hermes Trismegistus (from grc, Wiktionary:Ἑρμῆς, Ἑρμῆς ὁ Τρισμέγιστος, "Hermes the Thrice-Greatest"; Classical Latin: la, label=none, Mercurius ter Maximus) is a legendary Hellenistic figure that originated as a Syn ...
is an important theme in Hermeticism.


As a lucky or unlucky number

Three (, formal writing: ,
pinyin Hanyu Pinyin (), often shortened to just pinyin, is the official romanization system for Standard Mandarin Chinese in China, and to some extent, in Singapore and Malaysia. It is often used to teach Mandarin, normally written in Chinese for ...
''sān'',
Cantonese Cantonese ( zh, t=廣東話, s=广东话, first=t, cy=Gwóngdūng wá) is a language within the Chinese (Sinitic) branch of the Sino-Tibetan languages originating from the city of Guangzhou (historically known as Canton) and its surrounding are ...
: ''saam''1) is considered a good number in
Chinese culture Chinese culture () is one of the world's oldest cultures, originating thousands of years ago. The culture prevails across a large geographical region in East Asia and is extremely diverse and varying, with customs and traditions varying grea ...
because it sounds like the word "alive" ( pinyin ''shēng'', Cantonese: ''saang''1), compared to
four 4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest c ...
(, pinyin: ''sì'', Cantonese: ''sei''1), which sounds like the word "death" ( pinyin ''sǐ'', Cantonese: ''sei''2). Counting to three is common in situations where a group of people wish to perform an action in synchrony: ''Now, on the count of three, everybody pull!'' Assuming the counter is proceeding at a uniform rate, the first two counts are necessary to establish the rate, and the count of "three" is predicted based on the timing of the "one" and "two" before it. Three is likely used instead of some other number because it requires the minimal amount counts while setting a rate. There is another superstition that it is unlucky to take a third light, that is, to be the third person to light a cigarette from the same match or lighter. This superstition is sometimes asserted to have originated among soldiers in the trenches of the First World War when a sniper might see the first light, take aim on the second and fire on the third. The phrase " Third time's the charm" refers to the superstition that after two failures in any endeavor, a third attempt is more likely to succeed. This is also sometimes seen in reverse, as in "third man
o do something, presumably forbidden O, or o, is the fifteenth Letter (alphabet), letter and the fourth vowel letter in the Latin alphabet, used in the English alphabet, modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in ...
gets caught".
Luck Luck is the phenomenon and belief that defines the experience of improbable events, especially improbably positive or negative ones. The naturalistic interpretation is that positive and negative events may happen at any time, both due to rand ...
, especially bad luck, is often said to "come in threes".See
bad
in the ''Oxford Dictionary of Phrase and Fable'', 2006, via Encyclopedia.com.


Sports

* In
American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...
and
Canadian football Canadian football () is a team sport, sport played in Canada in which two teams of 12 players each compete for territorial control of a field of play long and wide attempting to advance a pointed oval-shaped ball into the opposing team's sco ...
, a
field goal A field goal (FG) is a means of scoring in gridiron football. To score a field goal, the team in possession of the ball must place kick, or drop kick, the ball through the goal, i.e., between the uprights and over the crossbar. The entire ba ...
is worth three points. *In
association football Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players who primarily use their feet to propel the ball around a rectangular field called a pitch. The objective of the game is ...
: ** For purposes of league standings, since the mid-1990s almost all leagues have awarded
three points for a win Three points for a win is a standard used in many sports leagues and group tournaments, especially in association football, in which three points are awarded to the team winning a match, with no points awarded to the losing team. If the game is ...
. ** A team that wins three trophies in a season is said to have won a
treble Treble may refer to: In music: *Treble (sound), tones of high frequency or range, the counterpart of bass *Treble voice, a choirboy or choirgirl singing in the soprano range *Treble (musical group), a three-piece girl group from the Netherlands *T ...
. ** A player who scores three goals in a match is said to have scored a
hat-trick A hat-trick or hat trick is the achievement of a generally positive feat three times in a match, or another achievement based on the number three. Origin The term first appeared in 1858 in cricket, to describe H. H. Stephenson taking three wic ...
. * In
baseball Baseball is a bat-and-ball sport played between two teams of nine players each, taking turns batting and fielding. The game occurs over the course of several plays, with each play generally beginning when a player on the fielding tea ...
: ** A batter strikes out upon the third strike in any single batting appearance. ** Each team's half of an inning ends once the defense has recorded three outs (unless the home team has a
walk-off hit Walk-off may refer to: *an event in a sporting event where the game-winning score immediately ends the game, such as a walk-off home run in baseball, a touchdown or field goal that's scored when there's no time left on the clock or during the overt ...
in the ninth inning or any extra inning). ** In scorekeeping, "3" denotes the first baseman. *In
basketball Basketball is a team sport in which two teams, most commonly of five players each, opposing one another on a rectangular Basketball court, court, compete with the primary objective of #Shooting, shooting a basketball (ball), basketball (appr ...
: ** Three points are awarded for a basket made from behind a designated arc on the floor. ** The "3 position" is the
small forward The small forward (SF), also known as the three or swingman, is one of the five positions in a regulation basketball game. Small forwards are typically shorter, quicker, and leaner than power forwards and centers but taller, larger, and stronger t ...
. *In
bowling Bowling is a target sport and recreational activity in which a player rolls a ball toward pins (in pin bowling) or another target (in target bowling). The term ''bowling'' usually refers to pin bowling (most commonly ten-pin bowling), though ...
, three
strikes Strike may refer to: People *Strike (surname) Physical confrontation or removal *Strike (attack), attack with an inanimate object or a part of the human body intended to cause harm *Airstrike, military strike by air forces on either a suspected ...
bowled consecutively is known as a "turkey". * In
cricket Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by striki ...
, a bowler who is credited with dismissals of batsmen on three consecutive deliveries has achieved a "hat-trick". *In
Gaelic games Gaelic games ( ga, Cluichí Gaelacha) are a set of sports played worldwide, though they are particularly popular in Ireland, where they originated. They include Gaelic football, hurling, Gaelic handball and rounders. Football and hurling, the ...
(Gaelic football for men and
women A woman is an adult female human. Prior to adulthood, a female human is referred to as a girl (a female child or Adolescence, adolescent). The plural ''women'' is sometimes used in certain phrases such as "women's rights" to denote female hum ...
,
hurling Hurling ( ga, iománaíocht, ') is an outdoor team game of ancient Gaelic Irish origin, played by men. One of Ireland's native Gaelic games, it shares a number of features with Gaelic football, such as the field and goals, the number of p ...
, and
camogie Camogie ( ; ga, camógaíocht ) is an Irish stick-and-ball team sport played by women. Camogie is played by 100,000 women in Ireland and worldwide, largely among Irish communities. A variant of the game of hurling (which is played by men onl ...
), three points are awarded for a goal, scored when the ball passes underneath the crossbar and between the goal posts. *In
ice hockey Ice hockey (or simply hockey) is a team sport played on ice skates, usually on an ice skating rink with lines and markings specific to the sport. It belongs to a family of sports called hockey. In ice hockey, two opposing teams use ice hock ...
: ** Scoring three goals is called a "hat trick" (usually not hyphenated in North America). ** A team will typically have three forwards on the ice at any given time. * In
professional wrestling Professional wrestling is a form of theater that revolves around staged wrestling matches. The mock combat is performed in a ring similar to the kind used in boxing, and the dramatic aspects of pro wrestling may be performed both in the ring o ...
, a
pin A pin is a device used for fastening objects or material together. Pin or PIN may also refer to: Computers and technology * Personal identification number (PIN), to access a secured system ** PIN pad, a PIN entry device * PIN, a former Dutch de ...
is when one holds the opponent's shoulders against the mat for a count of three. * In
rugby union Rugby union, commonly known simply as rugby, is a close-contact team sport that originated at Rugby School in the first half of the 19th century. One of the two codes of rugby football, it is based on running with the ball in hand. In its m ...
: ** A successful penalty kick for goal or
drop goal A drop goal, field goal, or dropped goal is a method of scoring points in rugby union and rugby league and also, rarely, in American football and Canadian football. A drop goal is scored by drop kicking the ball (dropping the ball and then kicki ...
is worth three points. ** In the French variation of the bonus points system, a team receives a bonus point in the league standings if it wins a match while scoring at least three more tries than its opponent. ** The starting
tighthead prop In the game of rugby union, there are 15 players on each team, comprising eight forwards (wearing jerseys numbered 1–8) and seven backs (numbered 9–15). In addition, there may be up to eight replacement players "on the bench", numbered 16– ...
wears the jersey number 3. * In
rugby league Rugby league football, commonly known as just rugby league and sometimes football, footy, rugby or league, is a full-contact sport played by two teams of thirteen players on a rectangular field measuring 68 metres (75 yards) wide and 112 ...
: ** One of the two starting centres wears the jersey number 3. (An exception to this rule is the
Super League The Super League (officially known as the Betfred Super League due to sponsorship from Betfred and legally known as Super League Europe), is the top-level of the British rugby league system. At present the league consists of twelve teams, of wh ...
, which uses static squad numbering.) *A "
threepeat In North American sports, a three-peat is winning three consecutive championships. The term, a portmanteau of the words ''three'' and ''repeat'', originated with the Los Angeles Lakers of the National Basketball Association, during their unsucces ...
" is a term for winning three consecutive championships. *A
triathlon A triathlon is an endurance multisport race consisting of Swimming (sport), swimming, Cycle sport, cycling, and running over various distances. Triathletes compete for fastest overall completion time, racing each segment sequentially with the t ...
consists of three events: swimming, bicycling, and running. *In many sports a competitor or team is said to win a Triple Crown if they win three particularly prestigious competitions. * In
volleyball Volleyball is a team sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules. It has been a part of the official program of the Summ ...
, once the ball is served, teams are allowed to touch the ball three times before being required to return the ball to the other side of the court, with the definition of "touch" being slightly different between indoor and beach volleyball.


Film

*A number of film versions of the novel ''
The Three Musketeers ''The Three Musketeers'' (french: Les Trois Mousquetaires, links=no, ) is a French historical adventure novel written in 1844 by French author Alexandre Dumas. It is in the swashbuckler genre, which has heroic, chivalrous swordsmen who fight f ...
'' by
Alexandre Dumas Alexandre Dumas (, ; ; born Dumas Davy de la Pailleterie (), 24 July 1802 – 5 December 1870), also known as Alexandre Dumas père (where '' '' is French for 'father', to distinguish him from his son Alexandre Dumas fils), was a French writer ...
: (
1921 Events January * January 2 ** The Association football club Cruzeiro Esporte Clube, from Belo Horizonte, is founded as the multi-sports club Palestra Italia by Italian expatriates in First Brazilian Republic, Brazil. ** The Spanish lin ...
,
1933 Events January * January 11 – Sir Charles Kingsford Smith makes the first commercial flight between Australia and New Zealand. * January 17 – The United States Congress votes in favour of Philippines independence, against the wis ...
,
1948 Events January * January 1 ** The General Agreement on Tariffs and Trade (GATT) is inaugurated. ** The Constitution of New Jersey (later subject to amendment) goes into effect. ** The railways of Britain are nationalized, to form British ...
,
1973 Events January * January 1 - The United Kingdom, the Republic of Ireland and Denmark enter the European Economic Community, which later becomes the European Union. * January 15 – Vietnam War: Citing progress in peace negotiations, U.S. ...
, 1992,
1993 File:1993 Events Collage.png, From left, clockwise: The Oslo I Accord is signed in an attempt to resolve the Israeli–Palestinian conflict; The Russian White House is shelled during the 1993 Russian constitutional crisis; Czechoslovakia is peace ...
and
2011 File:2011 Events Collage.png, From top left, clockwise: a protester partaking in Occupy Wall Street heralds the beginning of the Occupy movement; protests against Libyan dictator Muammar Gaddafi, who was killed that October; a young man celebrate ...
). *''
3 Days of the Condor ''Three Days of the Condor'' is a 1975 American political thriller film directed by Sydney Pollack and starring Robert Redford, Faye Dunaway, Cliff Robertson, and Max von Sydow. The screenplay by Lorenzo Semple Jr. and David Rayfiel was based ...
'' (1975), starring
Robert Redford Charles Robert Redford Jr. (born August 18, 1936) is an American actor and filmmaker. He is the List of awards and nominations received by Robert Redford, recipient of various accolades, including an Academy Awards, Academy Award from four nomi ...
, Faye Dunaway, Cliff Robertson, and Max von Sydow. *''
Three Amigos ''Three Amigos'' (stylized as ''¡Three Amigos!'') is a 1986 American Western comedy film directed by John Landis, written by Lorne Michaels, Steve Martin, and Randy Newman (who also wrote the film's songs), and starring Chevy Chase, Steve Mart ...
'' (1986), comedy film starring Steve Martin,
Chevy Chase Cornelius Crane "Chevy" Chase (; born October 8, 1943) is an American comedian, actor and writer. He became a key cast member in the first season of ''Saturday Night Live'', where his recurring ''Weekend Update'' segment became a staple of the ...
, and
Martin Short Martin Hayter Short (born March 26, 1950) is a Canadian-American actor, comedian, and writer. He has received various awards including two Primetime Emmy Awards, and a Tony Award. In 2019 Short became an Officer of the Order of Canada. He ...
. *''
Three Kings The biblical Magi from Middle Persian ''moɣ''(''mard'') from Old Persian ''magu-'' 'Zoroastrian clergyman' ( or ; singular: ), also referred to as the (Three) Wise Men or (Three) Kings, also the Three Magi were distinguished foreigners in the G ...
'' (1999), starring
George Clooney George Timothy Clooney (born May 6, 1961) is an American actor and filmmaker. He is the recipient of List of awards and nominations received by George Clooney, numerous accolades, including a British Academy Film Awards, British Academy Film A ...
,
Mark Wahlberg Mark Robert Michael Wahlberg (born June 5, 1971), former stage name Marky Mark, is an American actor, businessman, and former rapper. He has received multiple accolades, including a BAFTA Award, and nominations for two Academy Awards, three ...
,
Ice Cube An ice cube is a small piece of ice, which is typically rectangular as viewed from above and trapezoidal as viewed from the side. Ice cubes are products of mechanical refrigeration and are usually produced to cool beverages. They may be produc ...
, and
Spike Jonze Adam H. Spiegel (born October 22, 1969), known professionally as Spike Jonze, is an American filmmaker, actor, musician, and photographer. His work includes commercials, film, music videos, skateboard videos and television. Jonze began his ca ...
. *''
3 Days to Kill ''3 Days to Kill'' is a 2014 action thriller film directed by McG and written by Luc Besson and Adi Hasak. It stars Kevin Costner, Amber Heard, Hailee Steinfeld, Connie Nielsen, Richard Sammel, and Eriq Ebouaney. It was released on 21 February 20 ...
'' (2014), starring
Kevin Costner Kevin Michael Costner (born January 18, 1955) is an American actor, producer, film director and musician. He has received various accolades, including two Academy Awards, two Golden Globe Awards, a Primetime Emmy Award, and two Screen Actor ...
. *''
Three Billboards Outside Ebbing, Missouri ''Three Billboards Outside Ebbing, Missouri'' is a 2017 crime drama film written, directed, and co-produced by Martin McDonagh and starring Frances McDormand as a Missouri woman who rents three roadside billboards to draw attention to her daugh ...
'' (2017), starring Frances McDormand,
Woody Harrelson Woodrow Tracy Harrelson (born July 23, 1961) is an American actor and playwright. He is the recipient of various accolades, including a Primetime Emmy Award and two Screen Actors Guild Awards, in addition to nominations for three Academy Award ...
,
Sam Rockwell Sam Rockwell (born November 5, 1968) is an American actor. He is known for appearing in independent films and also as a character actor portraying a wide variety of roles both comedic and dramatic in films such as '' Lawn Dogs'' (199 ...
.


See also

*
Cube (algebra) In arithmetic and algebra, the cube of a number is its third power, that is, the result of multiplying three instances of together. The cube of a number or any other mathematical expression is denoted by a superscript 3, for example or . ...
– (3
superscript A subscript or superscript is a character (such as a number or letter) that is set slightly below or above the normal line of type, respectively. It is usually smaller than the rest of the text. Subscripts appear at or below the baseline, whil ...
) *
Third Third or 3rd may refer to: Numbers * 3rd, the ordinal form of the cardinal number 3 * , a fraction of one third * Second#Sexagesimal divisions of calendar time and day, 1⁄60 of a ''second'', or 1⁄3600 of a ''minute'' Places * 3rd Street (d ...
*
Triad Triad or triade may refer to: * a group of three Businesses and organisations * Triad (American fraternities), certain historic groupings of seminal college fraternities in North America * Triad (organized crime), a Chinese transnational orga ...
*
Rule of three Rule of three or Rule of Thirds may refer to: Science and technology *Rule of three (aeronautics), a rule of descent in aviation *Rule of three (C++ programming), a rule of thumb about class method definitions * Rule of three (computer programming ...
* List of highways numbered 3


References

*Wells, D. ''
The Penguin Dictionary of Curious and Interesting Numbers ''The Penguin Dictionary of Curious and Interesting Numbers'' is a reference book for recreational mathematics and elementary number theory written by David Wells. The first edition was published in paperback by Penguin Books in 1986 in the UK, a ...
'' London: Penguin Group. (1987): 46–48


External links


Tricyclopedic Book of Threes
by Michael Eck

by Dr. John A. McNulty *
The Number 3The Positive Integer 3
{{DEFAULTSORT:3 (Number) Integers