9 (nine) is the natural number following and preceding .

Evolution of the Arabic digit

In the beginning, various Indians wrote a digit 9 similar in shape to the modern closing question mark without the bottom dot. The Kshatrapa, Andhra and Gupta started curving the bottom vertical line coming up with a -look-alike. The Nagari continued the bottom stroke to make a circle and enclose the 3-look-alike, in much the same way that the sign @ encircles a lowercase ''a''. As time went on, the enclosing circle became bigger and its line continued beyond the circle downwards, as the 3-look-alike became smaller. Soon, all that was left of the 3-look-alike was a squiggle. The Arabs simply connected that squiggle to the downward stroke at the middle and subsequent European change was purely cosmetic. While the shape of the glyph for the digit 9 has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in TextFigs196

. The modern digit resembles an inverted ''6''. To disambiguate the two on objects and documents that can be inverted, they are often underlined. Another distinction from the 6 is that it is sometimes handwritten with two strokes and a straight stem, resembling a raised lower-case letter q. In a seven-segment display, the number 9 can be constructed in two ways, either with a hook at the end of its stem or without one. Most

LCD A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly but in ...

calculators use the former, but some VFD models use the latter.

Mathematics

Nine is the fourth composite number, and the first composite number that is odd. 9 is the highest single-digit number in the decimal system. It is the third square number (3²), and the second non-unitary square prime of the form ''p''² and first that is odd, with all subsequent squares of this form odd as well. By Mihăilescu's theorem, 9 is the only positive perfect power that is one more than another positive perfect power, since the square of 3 is one more than the

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 ...

of 2. A number that is 4 or 5

modulo In computing, the modulo operation returns the remainder or signed remainder of a division, after one number is divided by another (called the '' modulus'' of the operation). Given two positive numbers and , modulo (often abbreviated as ) is t ...

9 cannot be represented as the

sum of three cubes In the mathematics of sums of powers, it is an open problem to characterize the numbers that can be expressed as a sum of three cubes of integers, allowing both positive and negative cubes in the sum. A necessary condition for n to equal such a s ...

9 is a Motzkin number, for the number of ways of drawing non-intersecting chords between four points on a circle. Since , 9 is an

exponential factorial The exponential factorial is a positive integer ''n'' raised to the power of ''n'' − 1, which in turn is raised to the power of ''n'' − 2, and so on and so forth in a right-grouping manner. That is, : n^ The expon ...

. Six recurring nines appear in the decimal places 762 through 767 of . (See six nines in pi). The first non-trivial

magic square In recreational mathematics, a square array of numbers, usually positive integers, is called a magic square if the sums of the numbers in each row, each column, and both main diagonals are the same. The 'order' of the magic square is the number ...

is a

3

3

magic square made of nine cells, with a

magic constant The magic constant or magic sum of a magic square is the sum of numbers in any row, column, or diagonal of the magic square. For example, the magic square shown below has a magic constant of 15. For a normal magic square of order ''n'' – that is ...

of 15; there are no

2

2

magic squares with four cells. Meanwhile, a

9

9

magic square has a magic constant of

369 __NOTOC__ Year 369 (Roman numerals, CCCLXIX) 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 Galates and Victor (or, less frequentl ...

. A polygon with nine sides is called a nonagon. Also an ''enneagon'', it is able to fill a plane-vertex alongside an equilateral triangle and an regular octadecagon, or 18-sided polygon. There are nine distinct uniform colorings of the triangular tiling and the square tiling, which are the two simplest

regular tilings This article lists the regular polytopes and regular polytope compounds in Euclidean geometry, Euclidean, spherical geometry, spherical and hyperbolic geometry, hyperbolic spaces. The Schläfli symbol describes every regular tessellation of an ' ...

; the

hexagonal tiling In geometry, the hexagonal tiling or hexagonal tessellation is a regular tiling of the Euclidean plane, in which exactly three hexagons meet at each vertex. It has Schläfli symbol of or (as a truncated triangular tiling). English mathemat ...

, on the other hand, has three distinct uniform colorings. There are nine edge-transitive convex polyhedra in

three dimensions Three-dimensional space (also: 3D space, 3-space or, rarely, tri-dimensional space) is a geometric setting in which three values (called ''parameters'') are required to determine the position of an element (i.e., point). This is the informal ...

: *the five regular Platonic solids: the tetrahedron, octahedron,

, dodecahedron and

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 ...

; *the two quasiregular

Archimedean solid In geometry, an Archimedean solid is one of the 13 solids first enumerated by Archimedes. They are the convex uniform polyhedra composed of regular polygons meeting in identical vertices, excluding the five Platonic solids (which are composed ...

s: the cuboctahedron and the icosidodecahedron; and *two Catalan solids: the rhombic dodecahedron and the rhombic triacontahedron, which are duals to the only two quasiregular polyhedra. In

four-dimensional space A four-dimensional space (4D) is a mathematical extension of the concept of three-dimensional or 3D space. Three-dimensional space is the simplest possible abstraction of the observation that one only needs three numbers, called ''dimensions'', ...

, there are nine paracompact hyperbolic honeycomb Coxeter groups, as well as nine regular compact hyperbolic honeycombs from regular convex and

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

polychora In geometry, a 4-polytope (sometimes also called a polychoron, polycell, or polyhedroid) is a four-dimensional polytope. It is a connected and closed figure, composed of lower-dimensional polytopal elements: vertices, edges, faces ( polygons), ...

''. There are also nine uniform demitesseractic (

\mathrm D_

) Euclidean honeycombs in the fourth dimension. There are only three types of

Coxeter groups In mathematics, a Coxeter group, named after Harold Scott MacDonald Coxeter, H. S. M. Coxeter, is an group (mathematics), abstract group that admits a group presentation, formal description in terms of Reflection (mathematics), reflections (or Kal ...

of uniform figures in dimensions nine and thereafter, aside from the many families of prisms and proprisms: the

\mathrm A_

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. ...

groups, the

\mathrm B_

hypercube In geometry, a hypercube is an ''n''-dimensional analogue of a square () and a cube (). It is a closed, compact, convex figure whose 1- skeleton consists of groups of opposite parallel line segments aligned in each of the space's dimensions, ...

groups, and the

\mathrm D_

demihypercube groups. The ninth dimension is also the final dimension that contains Coxeter-Dynkin diagrams as uniform solutions in hyperbolic space. Inclusive of compact hyperbolic solutions, there are a total of 238 compact and paracompact Coxeter-Dynkin diagrams between dimensions two and nine, or equivalently between ranks three and ten. The most important of the last

_9

paracompact groups is the group

_9

with

1023 Year 1023 ( MXXIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events By place Europe * The Judge-Governor of Seville in Al-Andalus (modern Spain) takes advantage of the disinte ...

total honeycombs, the simplest of which is 6₂₁ whose vertex figure is the 5₂₁ honeycomb: the vertex arrangement of the densest-possible packing of spheres in 8 dimensions which forms the

\mathbb E_

lattice. The 6₂₁ honeycomb is made of 9-simplexes and

9-orthoplex In geometry, a 9-orthoplex or 9-cross polytope, is a regular 9-polytope with 18 vertices, 144 edges, 672 triangle faces, 2016 tetrahedron cells, 4032 5-cells ''4-faces'', 5376 5-simplex ''5-faces'', 4608 6-simplex ''6-faces'', 2304 7-simplex '' ...

es, with 1023 total polytope elements making up each 9-simplex. It is the final honeycomb figure with infinite facets and vertex figures in the k₂₁ family of semiregular polytopes, first defined by Thorold Gosset in 1900. There are nine

Heegner number In number theory, a Heegner number (as termed by Conway and Guy) is a square-free positive integer ''d'' such that the imaginary quadratic field \Q\left sqrt\right/math> has class number 1. Equivalently, its ring of integers has unique factoriza ...

s, or square-free positive integers

n

that yield an imaginary quadratic field

\Q\left sqrt\right /math> whose

ring of integers In mathematics, the ring of integers of an algebraic number field K is the ring of all algebraic integers contained in K. An algebraic integer is a root of a monic polynomial with integer coefficients: x^n+c_x^+\cdots+c_0. This ring is often deno ...

has a unique factorization, or class number of 1.

In decimal

A positive number is divisible by nine if and only if its digital root is nine. That is, if any natural number is multiplied by 9, and the digits of the answer are repeatedly added until it is just one digit, the sum will be nine: *2 × 9 = 18 (1 + 8 = 9) *3 × 9 = 27 (2 + 7 = 9) *9 × 9 = 81 (8 + 1 = 9) *121 × 9 = 1089 (1 + 0 + 8 + 9 = 18; 1 + 8 = 9) *234 × 9 = 2106 (2 + 1 + 0 + 6 = 9) *578329 × 9 = 5204961 (5 + 2 + 0 + 4 + 9 + 6 + 1 = 27; 2 + 7 = 9) *482729235601 × 9 = 4344563120409 (4 + 3 + 4 + 4 + 5 + 6 + 3 + 1 + 2 + 0 + 4 + 0 + 9 = 45; 4 + 5 = 9) There are other interesting patterns involving multiples of nine: *12345679 × 9 = 111111111 *12345679 × 18 = 222222222 *12345679 × 81 = 999999999 This works for all the multiples of 9. is the only other such that a number is divisible by ''n'' if and only if its digital root is divisible by ''n''. In base-''N'', the divisors of have this property. Another consequence of 9 being , is that it is also a Kaprekar number. The difference between a base-10 positive integer and the sum of its digits is a whole multiple of nine. Examples: *The sum of the digits of 41 is 5, and 41 − 5 = 36. The digital root of 36 is 3 + 6 = 9, which, as explained above, demonstrates that it is divisible by nine. *The sum of the digits of 35967930 is 3 + 5 + 9 + 6 + 7 + 9 + 3 + 0 = 42, and 35967930 − 42 = 35967888. The digital root of 35967888 is 3 + 5 + 9 + 6 + 7 + 8 + 8 + 8 = 54, 5 + 4 = 9. If dividing a number by the amount of 9s corresponding to its number of digits, the number is turned into a repeating decimal. (e.g. ) Casting out nines is a quick way of testing the calculations of sums, differences, products, and quotients of integers known as long ago as the 12th century.

List of basic calculations

Alphabets and codes

*In the NATO phonetic alphabet, the digit 9 is called "Niner". *Five-digit produce PLU codes that begin with 9 are

organic Organic may refer to: * Organic, of or relating to an organism, a living entity * Organic, of or relating to an anatomical organ Chemistry * Organic matter, matter that has come from a once-living organism, is capable of decay or is the product ...

Culture and mythology

Indian culture

Nine is a number that appears often in Indian culture and mythology. Some instances are enumerated below. *Nine influencers are attested in Indian astrology. *In the Vaisheshika branch of Hindu philosophy, there are nine universal substances or elements: Earth, Water, Air, Fire, Ether, Time, Space, Soul, and

Mind The mind is the set of faculties responsible for all mental phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, will, and sensation. They are responsible for various m ...

. * Navaratri is a nine-day festival dedicated to the nine forms of Durga. * Navaratna, meaning "nine jewels" may also refer to Navaratnas – accomplished courtiers, Navratan – a kind of dish, or a form of architecture. *In Indian aesthetics, there are nine kinds of Rasa.

Chinese culture

*Nine ( pinyin jiǔ) is considered a good number in Chinese culture because it sounds the same as the word "long-lasting" ( pinyin jiǔ). *Nine is strongly associated with the Chinese dragon, a symbol of magic and power. There are nine forms of the dragon, it is described in terms of nine attributes, and it has nine children. It has 117 scales – 81

yang Yang may refer to: * Yang, in yin and yang, one half of the two symbolic polarities in Chinese philosophy * Korean yang, former unit of currency of Korea from 1892 to 1902 * YANG, a data modeling language for the NETCONF network configuration pr ...

(masculine, heavenly) and 36

yin Yin may refer to: *the dark force in the yin and yang from traditional Chinese philosophy and medicine *Yīn (surname) (), a Chinese surname *Yǐn (surname) (), a Chinese surname *Shang dynasty, also known as the Yin dynasty **Yinxu or Yin, the S ...

(feminine, earthly). All three numbers are multiples of 9 (, , ) as well as having the same digital root of 9. *The dragon often symbolizes the Emperor, and the number nine can be found in many ornaments in the Forbidden City. *The circular altar platform (''Earthly Mount'') of the Temple of Heaven has one circular marble plate in the center, surrounded by a ring of nine plates, then by a ring of 18 plates, and so on, for a total of nine rings, with the outermost having *The name of the area called ''

Kowloon Kowloon () is an urban area in Hong Kong comprising the Kowloon Peninsula and New Kowloon. With a population of 2,019,533 and a population density of in 2006, it is the most populous area in Hong Kong, compared with Hong Kong Island and t ...

'' in Hong Kong literally means: ''nine dragons''. *The nine-dotted line () delimits certain island claims by China in the South China Sea. *The

nine-rank system The nine-rank system, also known as the nine-grade controller system, was used to categorize and classify government officials in Imperial China. Created in the state of Cao Wei during the Three Kingdoms, it was used until the Song dynasty, and sim ...

was a civil service nomination system used during certain Chinese dynasties. *9 Points of the Heart ( Heal) / Heart Master ( Immortality) Channels in Traditional Chinese Medicine.

Ancient Egypt

*The nine bows is a term used in Ancient Egypt to represent the traditional enemies of Egypt. *The

Ennead The Ennead or Great Ennead was a group of nine deities in Egyptian mythology worshipped at Heliopolis: the sun god Atum; his children Shu and Tefnut; their children Geb and Nut; and their children Osiris, Isis, Set, and Nephthys. The Ennead ...

is a group of nine Egyptian deities, who, in some versions of the

Osiris myth The Osiris myth is the most elaborate and influential story in ancient Egyptian mythology. It concerns the murder of the god Osiris, a primeval king of Egypt, and its consequences. Osiris's murderer, his brother Set, usurps his throne. Meanwhile, ...

, judged whether

Horus Horus or Heru, Hor, Har in Ancient Egyptian, is one of the most significant ancient Egyptian deities who served many functions, most notably as god of kingship and the sky. He was worshipped from at least the late prehistoric Egypt until the P ...

Set Set, The Set, SET or SETS may refer to: Science, technology, and mathematics Mathematics *Set (mathematics), a collection of elements *Category of sets, the category whose objects and morphisms are sets and total functions, respectively Electro ...

should inherit Egypt.

European culture

*The Nine Worthies are nine historical, or semi-legendary figures who, in the Middle Ages, were believed to personify the ideals of chivalry. *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 ...

, the universe is divided into nine worlds which are all connected by the

world tree The world tree is a motif present in several religions and mythologies, particularly Indo-European religions, Siberian religions, and Native American religions. The world tree is represented as a colossal tree which supports the heavens, thereb ...

Yggdrasil *In

as well, the number nine is associated with

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 ...

, as that is how many days he hung from the

Yggdrasil before attaining knowledge of 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 ...

Greek mythology

*The nine Muses in Greek mythology are Calliope (epic poetry), Clio (history),

Erato In Greek mythology, Erato (; grc, Ἐρατώ) is one of the Greek Muses, which were inspirational goddesses of literature, science, and the arts. The name would mean "desired" or "lovely", if derived from the same root as Eros, as Apollonius o ...

(erotic poetry),

Euterpe Euterpe (; el, Εὐτέρπη, lit=rejoicing well' or 'delight , from grc, εὖ, eû, well + el, τέρπειν, térpein, to please) was one of the Muses in Greek mythology, presiding over music. In late Classical times, she was named muse ...

(lyric poetry),

Melpomene In Greek mythology, Melpomene (; grc, Μελπομένη, Melpoménē, to sing' or 'the one that is melodious), initially the muse of chorus, eventually became the muse of tragedy, and is now best known in that association. Etymology Melp ...

(tragedy),

Polyhymnia Polyhymnia (; el, Πολυύμνια, lit=the one of many hymns), alternatively Polymnia (Πολύμνια), was, in Greek mythology, the Muse of sacred poetry, sacred hymn, dance and eloquence, as well as agriculture and pantomime. Etymology ...

(song), Terpsichore (dance),

Thalia Thalia, Thalía, Thaleia or Thalian may refer to: People * Thalia (given name), including a list of people with the name * Thalía (born 1971), Mexican singer and actress Mythological and fictional characters * Thalia (Grace), one of the three ...

(comedy), and Urania (astronomy). *It takes nine days (for an anvil) to fall from heaven to earth, and nine more to fall from earth to Tartarus. * Leto labored for nine days and nine nights for Apollo, according to the Homeric Hymn to Delian Apollo.

Mesoamerican mythology

* The Lords of the Night, is a group of nine deities who each ruled over every ninth night forming a calendrical cycle

Aztec mythology

* Mictlan the underworld in Aztec mythology, consists of nine levels.

Mayan mythology

* The Mayan underworld Xibalba consists of nine levels. * El Castillo the Mayan step-pyramid in Chichén Itzá, consists of nine steps. It is said that this was done to represent the nine levels of Xibalba.

Anthropology

Idioms

*"to go the whole nine yards-" *"A

cat-o'-nine-tails The cat o' nine tails, commonly shortened to the cat, is a type of multi-tailed whip or flail that originated as an implement for severe physical punishment, notably in the Royal Navy and British Army, and as a judicial punishment in Britain ...

suggests perfect punishment and atonement." – Robert Ripley. *"A cat has nine lives" *"to be on cloud nine" *"A stitch in time saves nine" *"found true 9 out of 10 times" *"possession is nine tenths of the law" *The word "K-9" pronounces the same as ''canine'' and is used in many US police departments to denote the police dog unit. Despite not sounding like the translation of the word ''canine'' in other languages, many police and military units around the world use the same designation. *Someone dressed "to the nines" is dressed up as much as they can be. *In North American urban culture, "nine" is a slang word for a 9mm

pistol A pistol is a handgun, more specifically one with the chamber integral to its gun barrel, though in common usage the two terms are often used interchangeably. The English word was introduced in , when early handguns were produced in Europe, an ...

homicide Homicide occurs when a person kills another person. A homicide requires only a volitional act or omission that causes the death of another, and thus a homicide may result from accidental, reckless, or negligent acts even if there is no inten ...

, the latter from the Illinois Criminal Code for homicide.

Society

*''

The 9 on Yahoo! ''The 9'' was a daily video compilation show, or vlog, on Yahoo! featuring the nine top web finds of the day. ''The 9'' was launched on Yahoo!'s homepage (and Yahoo! TV) on July 10, 2006. The show, hosted by Maria Sansone, followed a similar forma ...

'', hosted by

Maria Sansone Maria Grace Sansone (born February 26, 1981) is an American television personality. Sansone is the former co-anchor of ''Good Day LA'' on KTTV Fox 11 in Los Angeles until January 2017 and is a former field reporter for WNBC 4 New York, appearin ...

, was a daily video compilation show, or vlog, on Yahoo! featuring the nine top "web finds" of the day. *Nine justices sit on the United States Supreme Court. *Nine justices sit on the

Supreme Court of Canada The Supreme Court of Canada (SCC; french: Cour suprême du Canada, CSC) is the Supreme court, highest court in the Court system of Canada, judicial system of Canada. It comprises List of Justices of the Supreme Court of Canada, nine justices, wh ...

Technique

* Stanines, a method of scaling test scores, range from 1 to 9. *There are 9 square feet in a

square yard The square yard (Northern India: gaj, Pakistan: gaz) is an imperial unit and U.S. customary unit of area. It is in widespread use in most of the English-speaking world, particularly the United States, United Kingdom, Canada, Pakistan and India. ...

Pseudoscience

* 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 9 symbolizes the end of one cycle and the beginning of another.

Literature

*There are nine circles of Hell in Dante's '' Divine Comedy''. *The

Nine Bright Shiners The Old Kingdom, or Abhorsen in North America, is a fantasy series written by Australian author Garth Nix. It originated in 1995 with the novel ''Sabriel'' and has continued in the novels ''Lirael'' (2001), ''Abhorsen'' (2003) and ''Goldenhand'' ...

, characters in Garth Nix's

Old Kingdom trilogy The Old Kingdom, or Abhorsen in North America, is a fantasy series written by Australian author Garth Nix. It originated in 1995 with the novel ''Sabriel'' and has continued in the novels ''Lirael'' (2001), ''Abhorsen'' (2003) and ''Goldenhand'' ...

. ''The Nine Bright Shiners'' was a 1930s book of poems by Anne Ridler and a 1988 fiction book by Anthea Fraser; the name derives from "a very curious old semi-pagan, semi-Christian" song. *''

The Nine Tailors ''The Nine Tailors'' is a 1934 mystery novel by the British writer Dorothy L. Sayers, her ninth featuring Lord Peter Wimsey. The story is set in the Lincolnshire Fens, and revolves around a group of bell-ringers at the local parish church. The b ...

'' is a 1934 mystery novel by British writer Dorothy L. Sayers, her ninth featuring sleuth Lord Peter Wimsey. *

Nine Unknown Men ''The Nine Unknown'' is a 1923 novel by Talbot Mundy. Originally serialised in '' Adventure'' magazine, it concerns the Nine Unknown Men, a secret society founded to preserve and develop knowledge that would be dangerous to humanity if it fell in ...

are, in occult legend, the custodians of the sciences of the world since ancient times. *In J. R. R. Tolkien's Middle-earth, there are nine rings of power given to men, and consequently, nine ringwraiths. Additionally, The Fellowship of the Ring consists of nine companions. *In '' Lorien Legacies'' there are nine Garde sent to Earth. *Number Nine is a character in '' Lorien Legacies''. *In the series ''

A Song of Ice and Fire ''A Song of Ice and Fire'' is a series of epic fantasy novels by the American novelist and screenwriter George R. R. Martin. He began the first volume of the series, ''A Game of Thrones'', in 1991, and it was published in 1996. Martin, who init ...

'', there are nine regions of Westeros (the Crownlands, the North, the Riverlands, the Westerlands, the Reach, the Stormlands, the Vale of Arryn, the Iron Islands and Dorne). Additionally, there is a group of nine city-states in western Essos known collectively as the Free Cities (Braavos, Lorath, Lys, Myr, Norvos, Pentos, Qohor, Tyrosh and Volantis). *In '' The Wheel of Time'' series, Daughter of the Nine Moons is the title given to the heir to the throne of Seanchan, and the Court of the Nine Moons serves as the throne room of the Seanchan rulers themselves. Additionally, the nation of Illian is partially governed by a body known as the Council of Nine, and the flag of Illian displays nine golden bees on it. Furthermore, in the Age of Legends, the Nine Rods of Dominion were nine regional governors who administered individual areas of the world under the ruling world government.

Organizations

*Divine Nine – The National Pan-Hellenic Council (NPHC) is a collaborative organization of nine historically African American, international Greek-lettered fraternities and sororities.

Places and thoroughfares

List of highways numbered 9 Route 9, or Highway 9, may refer to: International * European route E09 * European route E009 Albania * SH-9 Road in Albania. Argentina * National Route 9 (Argentina), National Route 9 Australia New South Wales * A9 (Sydney) South Austra ...

* Ninth Avenue is a major avenue in Manhattan. * South Africa has 9 provinces *

Negeri Sembilan Negeri Sembilan (, Negeri Sembilan Malay: ''Nogoghi Sombilan'', ''Nismilan'') is a state in Malaysia which lies on the western coast of Peninsular Malaysia. It borders Selangor on the north, Pahang in the east, and Malacca and Johor to the s ...

, a Malaysian state located in Peninsular Malaysia, is named as such as it was historically a confederation of nine ( ms, sembilan) settlements ('' nagari'') of the Minangkabau migrated from West Sumatra.

Religion and philosophy

*Nine, as the highest single-digit number (in

base ten 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 numeral ...

), symbolizes completeness in the Baháʼí Faith. In addition, the word Baháʼ in the Abjad notation has a value of 9, and a 9-pointed star is used to symbolize the religion. *The number 9 is revered in Hinduism and considered a complete, perfected and divine number because it represents the end of a cycle in the

decimal 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 numeral ...

system, which originated from the Indian subcontinent as early as

3000 BC The 30th century BC was a century that lasted from the year 3000 BC to 2901 BC. Events * Before 3000 BC: An image of a deity (detail from a cong) recovered from Tomb 12 in Fanshan, Yuyao, Zhejiang, is made during the Neolithic period by the Li ...

. *In Buddhism, Gautama Buddha was believed to have nine virtues, which he was (1) Accomplished, (2) Perfectly Enlightened, (3) Endowed with knowledge and Conduct or Practice, (4) Well-gone or Well-spoken, (5) the Knower of worlds, (6) the Guide Unsurpassed of men to be tamed, (7) the Teacher of gods and men, (8) Enlightened, and (9) Blessed. *Important Buddhist rituals usually involve nine monks. *The first nine days of the Hebrew month of Av are collectively known as "The Nine Days" (''Tisha HaYamim''), and are a period of semi-mourning leading up to Tisha B'Av, the ninth day of Av on which both Temples in Jerusalem were destroyed. *Nine is a 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 ...

hung himself on an ash tree for nine days to learn the runes. *The

Fourth Way Enneagram The Fourth Way enneagram is a figure published in 1949 in ''In Search of the Miraculous'' by P.D. Ouspensky, and an integral part of the Fourth Way esoteric system associated with George Gurdjieff. The term " enneagram" derives from two Greek word ...

is one system of knowledge which shows the correspondence between the 9 integers and the circle. *In the Christian angelic hierarchy there are 9 choirs of angels. *

Ramadan , type = islam , longtype = Religious , image = Ramadan montage.jpg , caption=From top, left to right: A crescent moon over Sarıçam, Turkey, marking the beginning of the Islamic month of Ramadan. Ramadan Quran reading in Bandar Torkaman, Iran. ...

, the month of fasting and prayer, is the ninth month of the Islamic calendar. *Tian's Trigram Number, of Feng Shui, in Taoism. *In Christianity there are nine Fruit of the Holy Spirit which followers are expected to have: love, joy, peace, patience,

kindness Kindness is a type of behavior marked by acts of generosity, consideration, rendering assistant or concern for others, without expecting praise or reward in return. Kindness is a topic of interest in philosophy, religion, and psychology. Kin ...

goodness Goodness may refer to: * Good * ''Goodness!'', a 1969 album by jazz saxophonist Houston Person * Goodness and value theory * Goodness (band) * Goodness (Goodness album), ''Goodness'' (Goodness album) * Goodness (The Hotelier album), ''Goodness'' ( ...

, faithfulness, gentleness, and self-control. *The Bible recorded that Christ died at the 9th hour of the day (3 pm).

Science

Astronomy

*Before 2006 (when Pluto was officially designated as a non-planet), there were nine planets in the Solar System. * Messier object M9 is a magnitude 9.0 globular cluster in the constellation Ophiuchus. *The

New General Catalogue The ''New General Catalogue of Nebulae and Clusters of Stars'' (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and ...

br>object
NGC 9, a

spiral galaxy Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work ''The Realm of the Nebulae''constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Pegasus Pegasus ( grc-gre, Πήγασος, Pḗgasos; la, Pegasus, Pegasos) is one of the best known creatures in Greek mythology. He is a winged divine stallion usually depicted as pure white in color. He was sired by Poseidon, in his role as hor ...

Chemistry

*The purity of chemicals (see Nine (purity)). *Nine is the atomic number of

fluorine Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reacti ...

Physiology

A human pregnancy normally lasts nine months, the basis of

Naegele's rule The estimated date of delivery (EDD), also known as expected date of confinement, and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. Normal pregnancies last between 38 and 42 weeks. Chi ...

Psychology

Common terminal digit in

psychological pricing Psychological pricing (also price ending, charm pricing) is a pricing and marketing strategy based on the theory that certain prices have a psychological impact. In this pricing method, retail prices are often expressed as just-below numbers: ...

Sports

Nine-ball Nine-ball (sometimes written 9-ball) is a discipline of the cue sport pool. The game's origins are traceable to the 1920s in the United States. It is played on a rectangular billiard table with at each of the four corners and in the middle of e ...

is the standard professional pocket billiards variant played in the United States. *In association football (soccer), the centre-forward/striker traditionally (since at least the fifties) wears the number 9 shirt. *In baseball: **There are nine players on the field including the pitcher. **There are nine innings in a standard game. **9 represents the right fielder's position. **''NINE: A Journal of Baseball History and Culture'', published by the University of Nebraska Press *In rugby league, the jersey number assigned to the

hooker Hooker may refer to: People * Hooker (surname) Places Antarctica * Mount Hooker (Antarctica) * Cape Hooker (Antarctica) * Cape Hooker (South Shetland Islands) New Zealand * Hooker River * Mount Hooker (New Zealand) in the Southern Alps * Hoo ...

in most competitions. (An exception 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.) *In rugby union, the number worn by the starting scrum-half.

Technology

* ISO 9 is the ISO's standard for the transliteration of

Cyrillic , bg, кирилица , mk, кирилица , russian: кириллица , sr, ћирилица, uk, кирилиця , fam1 = Egyptian hieroglyphs , fam2 = Proto-Sinaitic , fam3 = Phoenician , fam4 = G ...

characters into Latin characters *In the

Rich Text Format ) As an example, the following RTF code would be rendered as follows: This is some bold text. Character encoding A standard RTF file can only consist of 7-bit ASCII characters, but can use escape sequences to encode other characters. Th ...

specification, 9 is the language code for the English language. All codes for regional variants of English are congruent to 9 mod 256. *

The9 The9 Ltd. () is a Shanghai-based online game operator which had the exclusive licence to operate and distribute World of Warcraft in China (launched in June 2005, it has since become the largest online game), a licence it secured after successf ...

Limited (owner o
the9.com
is a company in the video-game industry, including former ties to the extremely popular

MMORPG A massively multiplayer online role-playing game (MMORPG) is a video game that combines aspects of a role-playing video game and a massively multiplayer online game. As in role-playing games (RPGs), the player assumes the role of a Player charac ...

World of Warcraft.

Music

*" Revolution 9", a sound collage which appears on The Beatles' eponymous 1968 album ''The Beatles'' (aka ''The White Album''), prominently features a loop of a man's voice repeating the phrase "Number nine". *There are 9 semitones in a

Major 6th In music from Western culture, a sixth is a interval (music), musical interval encompassing six note letter names or staff positions (see Interval (music)#Number, Interval number for more details), and the major sixth is one of two commonly occ ...

interval in music. *There was a

superstition A superstition is any belief or practice considered by non-practitioners to be irrational or supernatural, attributed to fate or magic, perceived supernatural influence, or fear of that which is unknown. It is commonly applied to beliefs and ...

among some notable classical music composers that they would die after completing their ninth symphony. Some composers who died after composing their ninth symphony include Ludwig van Beethoven,

Anton Bruckner Josef Anton Bruckner (; 4 September 182411 October 1896) was an Austrian composer, organist, and music theorist best known for his symphonies, masses, Te Deum and motets. The first are considered emblematic of the final stage of Austro-Germ ...

Antonin Dvorak Antonin may refer to: People * Antonin (name) Places ;Poland * Antonin, Jarocin County, Greater Poland Voivodeship * Antonin, Kalisz County, Greater Poland Voivodeship * Antonin, Oborniki County, Greater Poland Voivodeship * Antonin, Ostrów ...

and

Gustav Mahler Gustav Mahler (; 7 July 1860 – 18 May 1911) was an Austro-Bohemian Romantic composer, and one of the leading conductors of his generation. As a composer he acted as a bridge between the 19th-century Austro-German tradition and the modernism ...