3 July 1975
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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. 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 ...
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 of an integer; in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals and can be written as . The usu ...
. 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 Chinese numerals are words and characters used to denote numbers in Chinese. Today, speakers of Chinese use three written numeral systems: the system of Arabic numerals used worldwide, and two indigenous systems. The more familiar indigenous s ...
) 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 Gold ...
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 translit. ; an, al-Andalus; ast, al-Ándalus; eu, al-Andalus; ber, ⴰⵏⴷⴰⵍⵓⵙ, label= Berber, translit=Andalus; ca, al-Àndalus; gl, al-Andalus; oc, Al Andalús; pt, al-Ândalus; es, al-Ándalus () was the M ...
, 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 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. E.Watson; Walter ...
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 thousands o ...
s, the digit 3, like the other decimal digits, has the height of a capital letter, 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 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 ...
"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 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#Symbologies, 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 ...
barcodes and standard 52-card decks.


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 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, i ...
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 p ...
with 5, and a cousin prime 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 edges and three 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, any three points, when non- colline ...
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 to ...
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 17th ...
, as well as the second Mersenne prime exponent and the second double Mersenne prime exponent, for 7 and 127, respectively. 3 is also the first of five known
Fermat prime In mathematics, a Fermat number, named after Pierre de Fermat, who first studied them, is a positive integer of the form :F_ = 2^ + 1, where ''n'' is a non-negative integer. The first few Fermat numbers are: : 3, 5, 17, 257, 65537, 429496 ...
s, 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 (and the second
Lucas prime The Lucas numbers or Lucas series are an integer sequence named after the mathematician François Édouard Anatole Lucas (1842–1891), who studied both that sequence and the closely related Fibonacci numbers. Lucas numbers and Fibonacci nu ...
), the second
Sophie Germain prime In number theory, a prime number ''p'' is a if 2''p'' + 1 is also prime. The number 2''p'' + 1 associated with a Sophie Germain prime is called a . For example, 11 is a Sophie Germain prime and 2 × 11 +  ...
, and the second factorial prime, 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 i ...
, and
Gauss Johann Carl Friedrich Gauss (; german: Gauß ; la, Carolus Fridericus Gauss; 30 April 177723 February 1855) was a German mathematician and physicist who made significant contributions to many fields in mathematics and science. Sometimes refer ...
proved that every integer is the sum of at most 3
triangular numbers 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 i ...
. 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' ...
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 con ...
. Three is the only prime which is one less than a perfect square. 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 ...
is
divisible In mathematics, a divisor of an integer n, also called a factor of n, is an integer m that may be multiplied by some integer to produce n. In this case, one also says that n is a multiple of m. An integer n is divisible or evenly divisible by ...
by three if the sum of its digits in
base 10 The decimal numeral system (also called the base-ten positional numeral system and denary or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numer ...
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 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 radi ...
. This works in
base 10 The decimal numeral system (also called the base-ten positional numeral system and denary or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numer ...
and in any
positional numeral system Positional notation (or place-value notation, or positional numeral system) usually denotes the extension to any base of the Hindu–Arabic numeral system (or decimal system). More generally, a positional system is a numeral system in which th ...
whose base divided by three leaves a remainder of one (bases 4, 7, 10, etc.). Three of the five
Platonic solids In geometry, a Platonic solid is a convex, regular polyhedron in three-dimensional Euclidean space. Being a regular polyhedron means that the faces are congruent (identical in shape and size) regular polygons (all angles congruent and all edges c ...
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 th ...
, the
octahedron In geometry, an octahedron (plural: octahedra, octahedrons) is a polyhedron with eight faces. The term is most commonly used to refer to the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at ea ...
, and the icosahedron. 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 th ...
, the
hexahedron A hexahedron (plural: hexahedra or hexahedrons) or sexahedron (plural: sexahedra or sexahedrons) is any polyhedron with six faces. A cube, for example, is a regular hexahedron with all its faces square, and three squares around each vertex. Ther ...
( cube), and the
dodecahedron In geometry, a dodecahedron (Greek , from ''dōdeka'' "twelve" + ''hédra'' "base", "seat" or "face") or duodecahedron is any polyhedron with twelve flat faces. The most familiar dodecahedron is the regular dodecahedron with regular pentagon ...
. 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 to ...
comprise the faces of the five Platonic solids – the
triangle A triangle is a polygon with three edges and three 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, any three points, when non- colline ...
, the
square In Euclidean geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90- degree angles, π/2 radian angles, or right angles). It can also be defined as a rectangle with two equal-length a ...
, and the pentagon. 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 Samian, or simply ; in Ionian Greek; ) was an ancient Ionian Greek philosopher and the eponymous founder of Pythagoreanism. His politi ...
and the
Pythagorean Pythagorean, meaning of or pertaining to the ancient Ionian mathematician, philosopher, and music theorist Pythagoras, may refer to: Philosophy * Pythagoreanism, the esoteric and metaphysical beliefs purported to have been held by Pythagoras * Ne ...
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 In geometry, an antiprism or is a polyhedron composed of two parallel direct copies (not mirror images) of an polygon, connected by an alternating band of triangles. They are represented by the Conway notation . Antiprisms are a subclass o ...
: 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 ...
, 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 mathematics, and especially in geometry, an object has icosahedral symmetry if it has the same symmetries as a regular icosahedron. Examples of other polyhedra with icosahedral symmetry include the regular dodecahedron (the dual of the ...
. In dimensions n ⩾ 5, there are only three regular polytopes: the n- simplexes, n- cubes, and n-
orthoplex In geometry, a cross-polytope, hyperoctahedron, orthoplex, or cocube is a regular, convex polytope that exists in ''n''- dimensional Euclidean space. A 2-dimensional cross-polytope is a square, a 3-dimensional cross-polytope is a regular octahed ...
es. In dimensions n9, the only three uniform polytope families, aside from the numerous infinite
proprism In geometry of 4 dimensions or higher, a proprism is a polytope resulting from the Cartesian product of two or more polytopes, each of two dimensions or higher. The term was coined by John Horton Conway for ''product prism''. The dimension of the ...
atic 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 mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus, a line has a dimension of one (1D) because only one coor ...
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 \mathrm _. The trisection of the angle 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 A giant star is a star with substantially larger radius and luminosity than a main-sequence (or ''dwarf'') star of the same surface temperature.Giant star, entry in ''Astronomy Encyclopedia'', ed. Patrick Moore, New York: Oxford University Press ...
in the Yerkes spectral classification scheme. *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 ...
. *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 ...
code of "
End of Text The End-of-Text character (ETX) is a control character used to inform the receiving computer that the end of a record has been reached. This may or may not be an indication that all of the data in a record have been received. In ASCII and in EBCD ...
". *Three is the number of
dimensions In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus, a line has a dimension of one (1D) because only one coordin ...
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. ...
to have three spatial dimensions, but some theories, such as string theory, suggest there are more. *Three is the number of elementary fermion generations according to the Standard Model of particle physics. *The
triangle A triangle is a polygon with three edges and three 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, any three points, when non- colline ...
, 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 to ...
with three edges 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 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 assoc ...
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 In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats. It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, tr ...
. Humans being
trichromatic Trichromacy or trichromatism is the possessing of three independent channels for conveying color information, derived from the three different types of cone cells in the eye. Organisms with trichromacy are called trichromats. The normal expl ...
, the retina contains three types of color receptor cells, or
cones A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex. A cone is formed by a set of line segments, half-lines, or lines conn ...
. *There are three
primary color A set of primary colors or primary colours (see spelling differences) consists of colorants or colored lights that can be mixed in varying amounts to produce a gamut of colors. This is the essential method used to create the perception of a ...
s in the additive 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 quant ...
(), sulfur () and mercury ().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 o ...
(weaknesses) and their
antidote An antidote is a substance that can counteract a form of poisoning. The term ultimately derives from the Greek term φάρμακον ἀντίδοτον ''(pharmakon) antidoton'', "(medicine) given as a remedy". Antidotes for anticoagulants are s ...
s 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 rep ...
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 James Churchward (27 February 1851 – 4 January 1936) was a British occult writer, inventor, engineer, and fisherman. Churchward is most notable for proposing the existence of a lost continent, called " Mu," in the Pacific Ocean. His writings o ...
's lost continent. *In Pythagorean numerology 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 ...
,
Kant Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German philosopher and one of the central Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemology, metaphysics, ethics, and aest ...
, Hegel, C. S. Peirce, and Karl Popper have made threefold divisions, or '' trichotomies'', which have been important in their work. * Hegel's dialectic 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 ...
*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 p ...
*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 religions, Indian religion or Indian philosophy#Buddhist philosophy, philosophical tradition based on Pre-sectarian Buddhism, teachings attributed to the Buddha. ...
*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 philosophical thought (道家; ''daojia'') or to a religion (道教; ''daojiao''), both of which share ideas and concepts of Chinese origin and emphasize living in harmony with the '' Ta ...
*The Christian Holy Trinity *The Triple Goddess 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 w ...


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), was a first-century Jewish preacher and religious ...
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 partic ...
, 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 lasted approximately three years. *During the
Agony in the Garden The Agony in the Garden of Gethsemane is an episode in the life of Jesus. After the Last Supper, Jesus enters a garden where he experiences great anguish and prays to be delivered from his impending death on the cross ("Take this cup from me") ...
, 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 ) (Simeon, Simon) , birth_date = , birth_place = Bethsaida, Gaulanitis, Syria, Roman Empire , death_date = Between AD 64–68 , death_place = probably Vatican Hill, Rome, Italia, Roman Empire , parents = John (or Jonah; Jona) , occupat ...
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 t ...
– wise men who were astronomers/astrologers from Persia – gave Jesus three gifts. *There are three Synoptic Gospels and three
epistles of John The Johannine epistles, the Epistles of John, or the Letters of John are three of the catholic epistles of the New Testament, thought to have been written between 85 and 100 AD. Most scholars agree that all three letters are written by the same a ...
. * Paul the Apostle went blind for three days after his conversion to Christianity.


Judaism

* Noah had three sons:
Ham Ham is pork from a leg cut that has been preserved by wet or dry curing, with or without smoking."Bacon: Bacon and Ham Curing" in ''Chambers's Encyclopædia''. London: George Newnes, 1961, Vol. 2, p. 39. As a processed meat, the term "ham ...
,
Shem Shem (; he, שֵׁם ''Šēm''; ar, سَام, Sām) ''Sḗm''; Ge'ez: ሴም, ''Sēm'' was one of the sons of Noah in the book of Genesis and in the book of Chronicles, and the Quran. The children of Shem were Elam, Ashur, Arphaxad, Lu ...
and Japheth *The Three
Patriarchs The highest-ranking bishops in Eastern Orthodoxy, Oriental Orthodoxy, the Catholic Church (above major archbishop and primate), the Hussite Church, Church of the East, and some Independent Catholic Churches are termed patriarchs (and in certa ...
:
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 Je ...
,
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 th ...
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 o ...
beat his donkey three times. *The prophet
Jonah Jonah or Jonas, ''Yōnā'', "dove"; gr, Ἰωνᾶς ''Iōnâs''; ar, يونس ' or '; Latin: ''Ionas'' Ben (Hebrew), son of Amittai, is a prophet in the Hebrew Bible and the Quran, from Gath-hepher of the northern Kingdom of Israel (Samaria ...
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 ...
:
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 ...
(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 ( ...
(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 ...
,
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 de ...
, 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 ...
: ''
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 o ...
'', ''
Mincha Mincha ( he, מִנחַה, pronounced as ; sometimes spelled ''Minchah'' or ''Minḥa'') is the afternoon prayer service in Judaism. Etymology The name ''Mincha'', meaning "present", is derived from the meal offering that accompanied each sacri ...
'', ''
Maariv ''Maariv'' or ''Maʿariv'' (, ), also known as ''Arvit'' (, ), is a Jewish prayer service held in the evening or night. It consists primarily of the evening ''Shema'' and '' Amidah''. The service will often begin with two verses from Psalms ...
'' *Three Shabbat 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 ...
:
Passover Passover, also called Pesach (; ), is a major Jewish holiday that celebrates the Biblical story of the Israelites escape from slavery in Egypt, which occurs on the 15th day of the Hebrew month of Nisan, the first month of Aviv, or spring. ...
, Shavuot, Sukkot *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 ...
s on the Passover Seder table *
The Three Weeks The Three Weeks or ''Bein ha-Metzarim'' (Hebrew: בין המצרים, "Between the Straits") (cf "dire straits") is a period of mourning commemorating the destruction of the first and second Jewish Temples. The Three Weeks start on the seventee ...
, a period of mourning bridging the fast days of
Seventeenth of Tammuz , observedby = Jews , date = 17th day of Tammuz , observances = Fasting, prayer , type = Jewish religious and national , significance = Date when the walls of Jerusalem were breached , relatedto = The fasts of the Tenth of Tevet and Tisha B'Av, ...
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, murder, sexual immorality *
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 ...
, 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 Rabbinic Judaism, rabbinical court of Judaism. In ancient times, it was the building block of the legal system in the Biblical Land of ...
is composed of three members *Potential converts 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 ...
tradition of the
Kabbalah Kabbalah ( he, קַבָּלָה ''Qabbālā'', literally "reception, tradition") is an esoteric method, discipline and school of thought in Jewish mysticism. A traditional Kabbalist is called a Mekubbal ( ''Məqūbbāl'' "receiver"). The defin ...
, 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 In Judaism, the Holy Spirit ( he, רוח הקודש, ''ruach ha-kodesh'') refers to the divine force, quality, and influence of God over the universe or over God's creatures, in given contexts.Maimonides, Moses. Part II, Ch. 45: "The various c ...
'' ("wind" or "spirit") and the lowest being '' nefesh'' ("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 Hist ...
(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 (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 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 philosophical thought (道家; ''daojia'') or to a religion (道教; ''daojiao''), both of which share ideas and concepts of Chinese origin and emphasize living in harmony with the '' Ta ...
. *The Three
Dantian Dantian, dan t'ian, dan tien or tan t'ien is loosely translated as "elixir field", "sea of qi", or simply "energy center". Dantian are the "qi focus flow centers", important focal points for meditative and exercise techniques such as qigong, m ...
s *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 Contex ...
* Three Sovereigns: Heaven
Fu Xi Fuxi or Fu Hsi (伏羲 ~ 伏犧 ~ 伏戲) is a culture hero in Chinese legend and mythology, credited along with his sister and wife Nüwa with creating humanity and the invention of music, hunting, fishing, domestication, and cooking as well a ...
(Hand – Head – 3º Eye), Humanity Shen Nong ( 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 ...
:
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" withi ...
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 school of Hindu philosophy. *The three paths to salvation in the '' Bhagavad Gita'' 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 meditati ...
,
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.


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 religion and one of the world's oldest organized faiths, based on the teachings of the Iranian-speaking prophet Zoroaster. It has a dualistic cosmology of good and evil within the framework of a monotheisti ...
.


Norse mythology

Three is a very significant number in Norse mythology, along with its powers 9 and 27. *Prior to Ragnarök, 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 ...
. *Odin endured three hardships upon the World Tree in his quest for the
runes Runes are the 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, and for specialised ...
: he hanged himself, wounded himself with a spear, and suffered from hunger and thirst. * Bor had three sons, Odin, 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 w ...
n Rule of Three. *The Triple Goddess: Maiden, Mother, Crone; the three fates. *The sons of Cronus:
Zeus Zeus or , , ; grc, Δῐός, ''Diós'', label= genitive Boeotian Aeolic and Laconian grc-dor, Δεύς, Deús ; grc, Δέος, ''Déos'', label= genitive el, Δίας, ''Días'' () is the sky and thunder god in ancient Greek reli ...
,
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 ...
, and Hades. *The Slavic god Triglav 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 George Ivanovich Gurdjieff (; rus, Гео́ргий Ива́нович Гурджи́ев, r=Geórgy Ivánovich Gurdzhíev, p=ɡʲɪˈorɡʲɪj ɪˈvanəvʲɪd͡ʑ ɡʊrd͡ʐˈʐɨ(j)ɪf; hy, Գեորգի Իվանովիչ Գյուրջիև; c. 1 ...
's Three Centers and the Law of Three. *'' Liber AL vel Legis'', the central scripture of the religion of
Thelema Thelema () is a Western esoteric and occult social or spiritual philosophy and new religious movement founded in the early 1900s by Aleister Crowley (1875–1947), an English writer, mystic, occultist, and ceremonial magician. The word ' ...
, 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 Hadit (sometimes Had) refers to a Thelemic deity. Hadit is the principal speaker of the second chapter of ''The Book of the Law'' (written or received by Aleister Crowley in 1904). Descriptions Hadit identifies himself as the point in the ...
and Ra-Hoor-Khuit. *The Triple Greatness of
Hermes Trismegistus Hermes Trismegistus (from grc, Ἑρμῆς ὁ Τρισμέγιστος, "Hermes the Thrice-Greatest"; Classical Latin: la, label=none, Mercurius ter Maximus) is a legendary Hellenistic figure that originated as a syncretic combination of t ...
is an important theme in
Hermeticism Hermeticism, or Hermetism, is a philosophical system that is primarily based on the purported teachings of Hermes Trismegistus (a legendary Hellenistic combination of the Greek god Hermes and the Egyptian god Thoth). These teachings are containe ...
.


As a lucky or unlucky number

Three (, formal writing: ,
pinyin Hanyu Pinyin (), often shortened to just pinyin, is the official romanization system for Standard Chinese, Standard Mandarin Chinese in China, and to some extent, in Singapore and Malaysia. It is often used to teach Mandarin, normally writte ...
''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 ar ...
: ''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 (, 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 forbiddengets 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 and
Canadian football Canadian football () is a 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 scoring area ( ...
, a field goal 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. ** 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 t ...
: ** A batter strikes out upon the third
strike 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 ...
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 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 court, compete with the primary objective of shooting a basketball (approximately in diameter) through the defender's h ...
: ** 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 ...
. *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), thou ...
, three strikes 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 str ...
, a bowler who is credited with dismissals of batsmen on three consecutive deliveries has achieved a "hat-trick". *In Gaelic games (Gaelic football for
men A man is an adult male human. Prior to adulthood, a male human is referred to as a boy (a male child or adolescent). Like most other male mammals, a man's genome usually inherits an X chromosome from the mother and a Y chro ...
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 adolescent). The plural ''women'' is sometimes used in certain phrases such as "women's rights" to denote female humans regardl ...
, hurling, and camogie), 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 h ...
: ** 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 or ...
, 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 ...
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 it ...
: ** 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 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 11 ...
: ** One of the two starting centres wears the jersey number 3. (An exception to this rule is the Super League, which uses static squad numbering.) *A " threepeat" is a term for winning three consecutive championships. *A
triathlon A triathlon is an endurance multisport race consisting of swimming, cycling, and running over various distances. Triathletes compete for fastest overall completion time, racing each segment sequentially with the time transitioning between the ...
consists of three events: swimming, bicycling, and running. *In many sports a competitor or team is said to win a
Triple Crown Triple Crown may refer to: Sports Horse racing * Triple Crown of Thoroughbred Racing * Triple Crown of Thoroughbred Racing (United States) ** Triple Crown Trophy ** Triple Crown Productions * Canadian Triple Crown of Thoroughbred Racing * Tri ...
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 Sum ...
, 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 ...
'' by Alexandre Dumas: ( 1921, 1933, 1948,
1973 Events January * January 1 - The United Kingdom, the Republic of Ireland and Denmark 1973 enlargement of the European Communities, enter the European Economic Community, which later becomes the European Union. * January 15 – Vietnam War: ...
, 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 peacefu ...
and 2011). *''
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 on ...
'' (1975), starring Robert Redford,
Faye Dunaway Dorothy Faye Dunaway (born January 14, 1941) is an American actress. She is the recipient of many accolades, including an Academy Award, a Primetime Emmy Award, three Golden Globe Awards, and a BAFTA Award. In 2011, the government of France mad ...
,
Cliff Robertson Clifford Parker Robertson III (September 9, 1923 – September 10, 2011) was an American actor whose career in film and television spanned over six decades. Robertson portrayed a young John F. Kennedy in the 1963 film '' PT 109'', and won the 19 ...
, and
Max von Sydow Max von Sydow ( , ; born Carl Adolf von Sydow; 10 April 1929 – 8 March 2020) was a Swedish-French actor. He had a 70-year career in European and American cinema, television, and theatre, appearing in more than 150 films and several television ...
. *''
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 M ...
'' (1986), comedy film starring
Steve Martin Stephen Glenn Martin (born August 14, 1945) is an American actor, comedian, writer, producer, and musician. He has won five Grammy Awards, a Primetime Emmy Award, and was awarded an Honorary Academy Award in 2013. Additionally, he was nominate ...
,
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. *''
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 ...
'' (1999), starring George Clooney,
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, and Spike Jonze. *''
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 Febru ...
'' (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'' (2017), starring
Frances McDormand Frances Louise McDormand (born Cynthia Ann Smith; June 23, 1957) is an American actress and producer. Throughout her career spanning over four decades, McDormand has received numerous accolades, including four Academy Awards, two Primetime Emm ...
,
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'' (19 ...
.


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) * Third * Triad * Rule of three *
List of highways numbered 3 The following highways are numbered 3, H-3, PRI-3, AH3, E03 and R3. For roads numbered A3, see A3 roads. For roads numbered M3, see M3. For roads numbered N3, see N3. For roads numbered 3A, see 3A. International * Asian Highway 3 * Europe ...


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, ...
'' 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