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{{About|the number|the year|AD 9|other uses|9 (disambiguation)|and|Number nine (disambiguation)}}
{{Infobox number
|number=9
|numeral=[[nonary]]
|divisor=1, 3, 9
|unicode=Ⅸ, ⅸ

|greek prefix=[[Wiktionary:ennea-|ennea-]]
|latin prefix=[[Wiktionary:nona-|nona-]]
|lang1=[[Amharic language|Amharic]]
|lang1 symbol=<span style="font-size:100%;">፱</span>
|lang2=[[Arabic language|Arabicl]] & [[Central Kurdish|Kurdish]]
|lang2 symbol=<span style="font-size:150%;">٩</span>
|lang3=[[Urdu]]
|lang3 symbol={{Urdu numeral|9|20}}
|lang4=[[Armenian numerals|Armenian numeral]]
|lang4 symbol=<span style="font-size:150%;">Թ</span>
|lang5=[[Bengali language|Bengali]]
|lang5 symbol=<span style="font-size:150%;">৯</span>
|lang6=[[Chinese numerals|Chinese/Japanese<br/>/Korean numeral]]
|lang6 symbol=九<br/>玖
|lang7=[[Devanāgarī]]
|lang7 symbol=<span style="font-size:150%;">९</span>
|lang8=[[Greek numerals|Greek numeral]]
|lang8 symbol=θ´
|lang9=[[Hebrew numerals|Hebrew numeral]]
|lang9 symbol=<span style="font-size:150%;">ט</span>
|lang10=[[Tamil numerals]]
|lang10 symbol=<span style="font-size:150%;">௯</span>
|lang11=[[Khmer numerals|Khmer]]
|lang11 symbol=៩
|lang12=[[Telugu language|Telugu numeral]]
|lang12 symbol=<span style="font-size:150%;">౯</span>
|lang13=[[Thai numerals|Thai numeral]]
|lang13 symbol=<span style="font-size:150%;">๙</span>}}
{{Wiktionary|nine}}
'''9''' ('''nine''') is the [[natural number]] following {{num|8}} and preceding {{num|10}}. Nine is the highest one-digit number in a system of numbers using base 10.

==Mathematics==
9 is a [[composite number]], its proper [[divisor]]s being {{num|1}} and {{num|3}}. It is 3 times 3 and hence the third [[square number]]. Nine is a [[Motzkin number]].<ref>{{Cite web |url=https://oeis.org/A001006 |title=Sloane's A001006 : Motzkin numbers |last= |first= |date= |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation |access-date=2016-06-01}}</ref> It is the first composite [[lucky number]], along with the first composite odd number and only single-digit composite odd number.

9 is the only positive [[perfect power]] that is one more than another positive perfect power, by [[Catalan conjecture|Mihăilescu's Theorem]].

9 is the highest single-digit number in the [[decimal|decimal system]]. It is the second non-unitary square [[prime number|prime]] of the form (''p''<sup>2</sup>) and the first that is odd. All subsequent squares of this form are odd.

Since {{nowrap|1=9 = 3<sup>2<sup>1</sup></sup>}}, 9 is an [[exponential factorial]].<ref>{{Cite web |url=https://oeis.org/A049384 |title=Sloane's A049384 : a(0)=1, a(n+1) = (n+1)^a(n) |last= |first= |date= |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation |access-date=2016-06-01}}</ref>

A [[polygon]] with nine sides is called a [[nonagon]] or enneagon.<ref>Robert Dixon, ''Mathographics''. New York: Courier Dover Publications: 24</ref> A group of nine of anything is called an ennead.

In [[decimal|base 10]] a positive number is divisible by 9 [[if and only if]] its [[digital root]] is 9.<ref>[[Martin Gardner]], ''A Gardner's Workout: Training the Mind and Entertaining the Spirit''. New York: A. K. Peters (2001): 155</ref> 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. {{nowrap|1=''n'' = {{num|3}}}} is the only other {{nowrap|''n'' > 1}} such that a number is divisible by ''n'' if and only if its digital root is divisible by ''n''. In [[positional notation|base-''N'']], the [[divisor]]s of {{nowrap|''N'' − 1}} have this property. Another consequence of 9 being {{nowrap|10 − 1}}, 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.

[[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&nbsp;century.<ref>[[Cajori, Florian]] (1991, 5e) ''A History of Mathematics'', AMS. {{ISBN|0-8218-2102-4}}. p.91</ref>

Six recurring nines appear in the decimal places 762 through 767 of [[pi|{{pi}}]], see [[Six nines in pi]].

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. {{nowrap|1={{sfrac|274|999}} = 0.274274274274...}})

There are nine [[Heegner number]]s.<ref>Bryan Bunch, ''The Kingdom of Infinite Number''. New York: W. H. Freeman & Company (2000): 93</ref>

===Probability===
In [[probability]], the '''nine''' is a [[logarithmic measure]] of the probability of an event, defined as the negative of the base-{{num|10}} [[logarithm]] of the probability of the event's [[Probability axioms|complement]].{{citation needed|date=October 2016}} For example, an event that is 99% likely to occur has an unlikelihood of 1% or 0.01, which amounts to {{nowrap|1=−log<sub>10</sub> 0.01 = 2 nines}} of probability. [[Zero]] probability gives zero nines {{nowrap|1=(−log<sub>10</sub> 1 = 0)}}. A 100% probability is considered to be impossible in most circumstances: that results in [[infinite improbability]]. The effectivity of processes and the [[availability]] of [[systems]] can be expressed (as a rule of thumb, not explicitly) as a series of "nines". For example, [[5 nines|"five nines" (99.999%)]] availability implies a total [[downtime]] of no more than five minutes per year&nbsp;– typically a very high degree of [[:wikt:reliability|reliability]]; but never 100%.

==List of basic calculations==
{|class="wikitable" style="text-align: center; background: white"
|-
! style="width:105px;"|[[Multiplication]]
!1
!2
!3
!4
!5
!6
!7
!8
!9
!10
! style="width:5px;"|
!20
!25
!50
!100
!1000
|-
|'''9 × ''x'''''
|'''9'''
|[[18 (number)|18]]
|[[27 (number)|27]]
|[[36 (number)|36]]
|[[45 (number)|45]]
|[[54 (number)|54]]
|[[63 (number)|63]]
|[[72 (number)|72]]
|[[81 (number)|81]]
|[[90 (number)|90]]
!
|[[180 (number)|180]]
|[[225 (number)|225]]
|450
|[[900 (number)|900]]
|[[9000 (number)|9000]]
|}

{|class="wikitable" style="text-align: center; background: white"
|-
! style="width:105px;"|[[Division (mathematics)|Division]]
!1
!2
!3
!4
!5
!6
!7
!8
!9
!10
! style="width:5px;"|
!11
!12
!13
!14
!15
|-
|'''9 ÷ ''x'''''
|'''9'''
|4.5
|3
|2.25
|1.8
|1.5
|1.{{overline|285714}}
|1.125
|1
|0.9
!
|0.{{overline|81}}
|0.75
|0.{{overline|692307}}
|0.6{{overline|428571}}
|0.6
|-
|''''x'' ÷ 9'''
|0.{{overline|1}}
|0.{{overline|2}}
|0.{{overline|3}}
|0.{{overline|4}}
|0.{{overline|5}}
|0.{{overline|6}}
|0.{{overline|7}}
|0.{{overline|8}}
|1
|1.{{overline|1}}
!
|1.{{overline|2}}
|1.{{overline|3}}
|1.{{overline|4}}
|1.{{overline|5}}
|1.{{overline|6}}
|}

{|class="wikitable" style="text-align: center; background: white"
|-
! style="width:105px;"|[[Exponentiation]]
!1
!2
!3
!4
!5
!6
!7
!8
!9
!10
|-
|'''9{{sup|''x''}}'''
|'''9'''
|81
|729
|6561
|59049
|531441
|4782969
|43046721
|387420489
|3486784401
|-
|'''''x''{{sup|9}}'''
|1
|[[512 (number)|512]]
|19683
|262144
|1953125
|10077696
|40353607
|134217728
|387420489
|[[1000000000 (number)|1000000000]]
|}

{|class="wikitable" style="text-align: center; background: white"
|-
! rowspan="2" style="width:105px;"|[[Radix]]
!1
!5
!10
!15
!20
!25
!30
<!--
!35
-->
!40
<!--
!45
-->
!50
!60
!70
!80
!90
!100
|-
!110
!120
!130
!140
!150
<!--
!160
!170
!180
!190
-->
!200
!250
!500
!1000
!10000
!100000
!1000000
|
|
|-
|rowspan="2"|'''''x''{{sub|9}}
|1
|5
|11<sub>9</sub>
|16<sub>9</sub>
|22<sub>9</sub>
|27<sub>9</sub>
|33<sub>9</sub>
|44<sub>9</sub>
|55<sub>9</sub>
|66<sub>9</sub>
|77<sub>9</sub>
|88<sub>9</sub>
|110<sub>9</sub>
|121<sub>9</sub>
|-
|132<sub>9</sub>
|143<sub>9</sub>
|154<sub>9</sub>
|165<sub>9</sub>
|176<sub>9</sub>
|242<sub>9</sub>
|307<sub>9</sub>
|615<sub>9</sub>
|1331<sub>9</sub>
|14641<sub>9</sub>
|162151<sub>9</sub>
|1783661<sub>9</sub>
|}

==Evolution of the glyph==
{{See also|Hindu-Arabic numeral system}}
According to Georges Ifrah, the origin of the 9 integers can be attributed to ancient Indian civilization, and was adopted by subsequent civilizations in conjunction with the {{num|0}}.<ref>{{cite book |title=From One to Zero: A Universal History of Numbers |year=1985 |author=Georges Ifrah |publisher=Viking |isbn=0-670-37395-8}}</ref>

[[File:Evo9glyph.svg|x50px|right]]
In the beginning, various Indians wrote 9 similar 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 {{num|3}}-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 ''@'' character 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 9 character has an [[Ascender (typography)|ascender]] in most modern [[typeface]]s, in typefaces with [[text figures]] the character usually has a [[descender]], as, for example, in [[File:TextFigs196.png]].

This numeral resembles an inverted ''6''. To disambiguate the two on objects and documents that can be inverted, the 9 is often underlined, as is done for the 6. Another distinction from the 6 is that it is sometimes handwritten with a straight stem, resembling a raised lower-case letter '''q'''.

==Alphabets and codes==
*In the [[NATO phonetic alphabet]], the digit 9 is called "Niner".
*Five-digit [[produce]] [[Price Look-Up code|PLU codes]] that begin with 9 are [[Organic food|organic]].

==Commerce==
*Common terminal digit in [[psychological pricing]].

==Culture and mythology==
===Indian culture===
{{unreferenced section|date=April 2015}}
Nine is a number that appears often in [[Indian culture]] and mythology. Some instances are enumerated below.
*Nine [[Navagraha|influencers]] are attested in [[Indian astrology]].
*In the [[Vaisheshika]] branch of [[Hindu philosophy]], there are nine universal substances or elements: [[Prithvi|Earth]], [[Ap (water)|Water]], [[Vayu|Air]], [[Agni|Fire]], [[Akasha|Ether]], [[Kāla (time)|Time]], [[Vaisheshika#The Categories or Pad.C4.81rtha|Space]], [[Ātman (Hinduism)|Soul]], and [[Manas (early Buddhism)|Mind]].
*[[Navaratri]] is a nine-day festival dedicated to the [[Navadurga|nine]] forms of [[Durga]].
*[[Navaratna]], meaning "nine jewels" may also refer to [[Navaratnas]] – accomplished courtiers, [[Korma#Navratan korma|Navratan]] – a kind of dish, or a form of [[Navaratna (architecture)|architecture]].
*According to [[Yoga]], the human body has nine doors – two eyes, two ears, the mouth, two nostrils, and the openings for defecation and procreation.
*In [[Indian aesthetics]], there are nine kinds of [[Rasa (aesthetics)|Rasa]].

===Chinese culture===
*Nine ({{lang|zh|九}} [[pinyin]] jiǔ) is considered a good [[Numbers in Chinese culture|number in Chinese culture]] because it sounds the same as the word "long-lasting" ({{lang|zh|久}} [[pinyin]] jiǔ).{{Citation needed|date=April 2008}}
*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&nbsp;– 81 [[yin and yang|yang]] (masculine, heavenly) and 36 [[yin and yang|yin]] (feminine, earthly). All three numbers are multiples of 9 ({{nowrap|1=9 × 13 = 117}}, {{nowrap|1=9 × 9 = 81}}, {{nowrap|1=9 × 4 = 36}})<ref>{{cite book |title=Myths of China And Japan |author=Donald Alexander Mackenzie |url=https://books.google.com/books?id=vzbeLy4TBa4C&pg=PA46&dq=chinese+dragon+scales+yin+36 |publisher=Kessinger |year=2005 |isbn=1-4179-6429-4}}</ref> as well as having the same [[digital root]] of 9.
*The dragon often symbolizes the [[Emperor of China|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 {{nowrap|1=81 = 9 × 9 plates.}}
*The name of the area called ''[[Kowloon]]'' in [[Hong Kong]] literally means: ''nine [[Chinese dragon|dragons]]''.
*The [[nine-dotted line]] ({{zh|c=南海九段线|p=nánhǎi jiǔduàn xiàn|l=Nine-segment line of the South China Sea}}) delimits certain island [[Territorial disputes in the South China Sea|claims by China]] in the South China Sea.
*The [[nine-rank system]] was a civil service nomination system used during certain Chinese dynasties.
*9 Points of the [[Heart]] ([[Healing|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]] is a group of nine Egyptian deities, who, in some versions of the [[Osiris myth]], judged whether [[Horus]] or [[Set (mythology)|Set]] 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]], the universe is divided into [[Norse cosmology|nine worlds]] which are all connected by the [[world tree]] [[Yggdrasil]].

===Greek mythology===
*The nine [[Muse]]s in Greek mythology are [[Calliope]] (epic poetry), [[Clio]] (history), [[Erato]] (erotic poetry), [[Euterpe]] (lyric poetry), [[Melpomene]] (tragedy), [[Polyhymnia]] (song), [[Terpsichore]] (dance), [[Thalia (muse)|Thalia]] (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|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, Chichen_Itza|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]] 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 [[United States|U.S.]] 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]] or [[homicide]], the latter from the Illinois Criminal Code for homicide.

===Society===
*''[[The 9 on Yahoo!]]'', hosted by [[Maria Sansone]], 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]].

===Technique===
[[Image:ICS Niner.svg|right|thumb|100px|[[International maritime signal flag]] for 9]]
[[Image:9 playing cards.jpg|thumb|250px|[[Playing card]]s showing the 9 of all four suits]]
*[[Stanine]]s, a method of scaling test scores, range from 1 to 9.
*There are 9 [[Square foot|square feet]] in a [[square yard]].

==Literature==
*There are [[Divine Comedy#The Circles of Hell|nine circles of Hell]] in Dante's ''[[Divine Comedy]]''.
*The [[Nine Bright Shiners]], characters in Garth Nix's [[Old Kingdom trilogy]]. ''The Nine Bright Shiners'' was a 1930s book of poems by Anne Ridler<ref>{{cite book |title=Women's Poetry of the 1930s: A Critical Anthology |author=Jane Dowson |year=1996 |publisher=Routledge |isbn=0-415-13095-6 |url=https://books.google.com/books?id=fVTQPI3ZIHcC&pg=RA1-PA103&dq=nine-bright-shiners+ridler&ie=ISO-8859-1#PRA1-PA103,M1}}</ref> and a 1988 fiction book by Anthea Fraser;<ref>{{cite book |title=The Nine Bright Shiners |author=Anthea Fraser |publisher=Doubleday |year=1988 |isbn=0-385-24323-5 |url=}}</ref> the name derives from "a very curious old semi-pagan, semi-Christian" song.<ref>{{cite book |title=Recollections of an Eton Colleger, 1898-1902 |author=Charles Herbert Malden |publisher=Spottiswoode |year=1905 |url=https://books.google.com/books?id=EKB9T4pPcfkC&pg=PA182&dq=nine-bright-shiners#PPA180,M1}}</ref>
*''[[The Nine Tailors]]'' is a 1934 [[mystery novel]] by [[United Kingdom|British]] writer [[Dorothy L. Sayers]], her ninth featuring sleuth [[Lord Peter Wimsey]].
*[[Nine Unknown Men]] 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 [[Nazgul|ringwraiths]]. Additionally, [[The Fellowship of the Ring#Members of the Fellowship of the Ring|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]]'', 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).

==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]]
*[[Ninth Avenue (Manhattan)|Ninth Avenue]] is a major avenue in Manhattan.

==Religion and philosophy==
[[Image:Bahai star.svg|150px|right|A nine-pointed star]]
*Nine, as the highest single-digit number (in [[decimal|base ten]]), symbolizes completeness in the [[Bahá'í Faith]]. In addition, the word Bahá' in the [[Abjad numerals|Abjad notation]] has a value of 9, and a 9-pointed star is used to [[Bahá'í symbols|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]] system, which originated from the Indian subcontinent as early as [[30th century BC|3000 BC]].
*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 calendar|Hebrew month]] of [[Av (month)|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 [[Temple in Jerusalem|Temples in Jerusalem]] were destroyed.
*Nine is a significant number in [[Norse Mythology]]. [[Odin]] hung himself on an ash tree for nine days to learn the runes.
*The [[Fourth Way Enneagram]] 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 (calendar month)|Ramadan]], the month of fasting and prayer, is the ninth month of the [[Islamic calendar]].
*Tian's Trigram Number, of Feng Shui, in [[Taoism]].

==Science==
===Astronomy===
*Before 2006 (when Pluto was [[Pluto#2006: IAU classification|officially designated as a non-planet]]), there were nine [[planet]]s in the [[solar system]].
*[[Messier object]] [[Messier 9|M9]] is a magnitude 9.0 [[globular cluster]] in the constellation [[Ophiuchus]].
*The [[New General Catalogue]] [http://www.ngcic.org/ object] [[NGC 9]], a [[spiral galaxy]] in the [[constellation]] [[Pegasus (constellation)|Pegasus]].

===Chemistry===
*The purity of chemicals (see [[Nine (purity)]]).
*Nine is the [[atomic number]] of [[fluorine]].

===Physiology===
A human [[pregnancy]] normally lasts nine months, the basis of [[Naegele's rule]].

==Sports==
[[File:9ball rack 2.jpg|thumb|right|200px|Billiards: A [[Nine-ball]] [[Rack (billiards)|rack]] with the no. 9 ball at the center]]
*[[Nine-ball]] 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]]<ref>{{cite web |url=http://nine.iweb.bsu.edu/ |title=Web site for NINE: A Journal of Baseball History & Culture |accessdate=20 February 2013}}</ref>
*In [[rugby league]], the jersey number assigned to the [[Hooker (rugby league)|hooker]] in most competitions. (An exception is the European [[Super League]], which uses static squad numbering.)
*In [[rugby union]], the number worn by the starting [[Scrum-half (rugby union)|scrum-half]].

==Technology==
[[Image:Seven-segment 9.svg|25px|right]]
[[Image:Seven-segment 9 alt.svg|25px|right]]
*[[ISO 9]] is the [[International Organization for Standardization|ISO]]'s standard for the transliteration of [[Cyrillic]] characters into [[Latin]] characters
*In the [[Rich Text Format]] specification, 9 is the language code for the [[English language]]. All codes for regional variants of English are congruent to 9 mod 256.
*The [[seven-segment display]] allows the number 9 to be constructed two ways, either with a hook at the end of its stem or without one. Most [[liquid crystal display|LCD]] calculators use the former, but some [[vacuum fluorescent display|VFD]] models use the latter.
*[[The9]] Limited (owner of [http://the9.com the9.com]) is a company in the video-game industry, including former ties to the extremely popular [[MMORPG]] [[World of Warcraft]].

==Music==
*"[[Revolution 9]]", a sound collage which appears on The Beatles' eponymous 1968 album [[The Beatles (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]] interval in music.

==See also==
{{Portal|Mathematics}}
*[[9 (disambiguation)]]
*[[0.999...]]
*[[wikt:cloud nine|Cloud Nine]]

==References==
{{Reflist|35em}}

==Further reading==
*Cecil Balmond, "Number 9, the search for the sigma code" 1998, Prestel 2008, {{ISBN|3-7913-1933-7}}, {{ISBN|978-3-7913-1933-9}}

{{Integers|zero}}

{{DEFAULTSORT:9 (Number)}}
[[Category:Integers]]
[[Category:9 (number)]]
[[Category:Superstitions about numbers]]

Revision as of 01:56, 26 June 2018

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