8

8 (eight) is the natural number following 7 and preceding 9.

This article is about the number. For the year, see AD 8. For other uses, see 8 (disambiguation) and Number Eight (disambiguation).

← 7 8 9 →
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Cardinaleight
Ordinal8th
(eighth)
Numeral systemoctal
Factorization23
Divisors1, 2, 4,
Greek numeralΗ´
Roman numeralVIII, viii
Greek prefixocta-/oct-
Latin prefixocto-/oct-
Binary10002
Ternary223
Octal108
Duodecimal812
Hexadecimal816
Greekη (or Η)
Arabic, Kurdish, Persian, Sindhi, Urdu٨
Amharic፰
Bengali৮
Chinese numeral八,捌
Devanāgarī८
Kannada೮
Malayalam൮
Telugu౮
Tamil௮
Hebrewח
Khmer៨
Thai๘
ArmenianԸ ը

In mathematics

8 is:

  • a composite number, its proper divisors being 1, 2, and 4. It is twice 4 or four times 2.
  • a power of two, being 23 (two cubed), and is the first number of the form p3, p being an integer greater than 1.
  • the first number which is neither prime nor semiprime.
  • the base of the octal number system,[1] which is mostly used with computers. In octal, one digit represents three bits. In modern computers, a byte is a grouping of eight bits, also called an octet.
  • a Fibonacci number, being 3 plus 5. The next Fibonacci number is 13. 8 is the only positive Fibonacci number, aside from 1, that is a perfect cube.[2]
  • the only nonzero perfect power that is one less than another perfect power, by Mihăilescu's Theorem.
  • the order of the smallest non-abelian group all of whose subgroups are normal.
  • the dimension of the octonions and is the highest possible dimension of a normed division algebra.
  • the first number to be the aliquot sum of two numbers other than itself; the discrete biprime 10, and the square number 49.

A number is divisible by 8 if its last three digits, when written in decimal, are also divisible by 8, or its last three digits are 0 when written in binary.

There are a total of eight convex deltahedra.[3]

A polygon with eight sides is an octagon.[4] Figurate numbers representing octagons (including eight) are called octagonal numbers.

A polyhedron with eight faces is an octahedron.[5] A cuboctahedron has as faces six equal squares and eight equal regular triangles.[6]

A cube has eight vertices.[7]

Sphenic numbers always have exactly eight divisors.[8]

The number 8 is involved with a number of interesting mathematical phenomena related to the notion of Bott periodicity. For example, if O(∞) is the direct limit of the inclusions of real orthogonal groups

,

then

.

Clifford algebras also display a periodicity of 8.[9] For example, the algebra Cl(p + 8,q) is isomorphic to the algebra of 16 by 16 matrices with entries in Cl(p,q). We also see a period of 8 in the K-theory of spheres and in the representation theory of the rotation groups, the latter giving rise to the 8 by 8 spinorial chessboard. All of these properties are closely related to the properties of the octonions.

The spin group Spin(8) is the unique such group that exhibits the phenomenon of triality.

The lowest-dimensional even unimodular lattice is the 8-dimensional E8 lattice. Even positive definite unimodular lattices exist only in dimensions divisible by 8.

A figure 8 is the common name of a geometric shape, often used in the context of sports, such as skating.[10] Figure-eight turns of a rope or cable around a cleat, pin, or bitt are used to belay something.[11]

List of basic calculations
Multiplication 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
8 × x 8 16 24 32 40 48 56 64 72 80 88 96 104 112 120
Division 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
8 ÷ x 8 4 2.6 2 1.6 1.3 1.142857 1 0.8 0.8 0.72 0.6 0.615384 0.571428 0.53
x ÷ 8 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 1.625 1.75 1.875
Exponentiation 1 2 3 4 5 6 7 8 9 10 11 12 13
8x 8 64 512 4096 32768 262144 2097152 16777216 134217728 1073741824 8589934592 68719476736 549755813888
x8 1 256 6561 65536 390625 1679616 5764801 16777216 43046721 100000000 214358881 429981696 815730721

Etymology

English eight, from Old English eahta, æhta, Proto-Germanic *ahto is a direct continuation of Proto-Indo-European *oḱtṓ(w)-, and as such cognate with Greek ὀκτώ and Latin octo-, both of which stems are reflected by the English prefix oct(o)-, as in the ordinal adjective octaval or octavary, the distributive adjective is octonary. The adjective octuple (Latin octu-plus) may also be used as a noun, meaning "a set of eight items"; the diminutive octuplet is mostly used to refer to eight siblings delivered in one birth.

The Semitic numeral is based on a root *θmn-, whence Akkadian smn-, Arabic ṯmn-, Hebrew šmn- etc. The Chinese numeral, written 八 (Mandarin: bā; Cantonese: baat), is from Old Chinese *priāt-, ultimately from Sino-Tibetan b-r-gyat or b-g-ryat which also yielded Tibetan brgyat.

It has been argued that, as the cardinal number 7 is the highest number of item that can universally be cognitively processed as a single set, the etymology of the numeral eight might be the first to be considered composite, either as "twice four" or as "two short of ten", or similar. The Turkic words for "eight" are from a Proto-Turkic stem *sekiz, which has been suggested as originating as a negation of eki "two", as in "without two fingers" (i.e., "two short of ten; two fingers are not being held up");[12] this same principle is found in Finnic *kakte-ksa, which conveys a meaning of "two before (ten)". The Proto-Indo-European reconstruction *oḱtṓ(w)- itself has been argued as representing an old dual, which would correspond to an original meaning of "twice four". Proponents of this "quaternary hypothesis" adduce the numeral 9, which might be built on the stem new-, meaning "new" (indicating the beginning of a "new set of numerals" after having counted to eight).[13]

Glyph
Evolution of the numeral 8 from the Indians to the Europeans

The modern 8 glyph, like all modern Arabic numerals (other than zero) originates with the Brahmi numerals. The Brahmi numeral for eight by the 1st century was written in one stroke as a curve └┐ looking like an uppercase H with the bottom half of the left line and the upper half of the right line removed. However the eight glyph used in India in the early centuries of the Common Era developed considerable variation, and in some cases took the shape of a single wedge, which was adopted into the Perso-Arabic tradition as ٨ (and also gave rise to the later Devanagari numeral ८); the alternative curved glyph also existed as a variant in Perso-Arabic tradition, where it came to look similar to our glyph 5.

The numerals as used in Al-Andalus by the 10th century were a distinctive western variant of the glyphs used in the Arabic-speaking world, known as ghubār numerals (ghubār translating to "sand table"). In these numerals, the line of the 5-like glyph used in Indian manuscripts for eight came to be formed in ghubār as a closed loop, which was the 8-shape that became adopted into European use in the 10th century.[14]

Just as in most modern typefaces, in typefaces with text figures the 8 character usually has an ascender, as, for example, in .

The infinity symbol ∞, described as a "sideways figure eight" is unrelated to the 8 glyph in origin; it is first used (in the mathematical meaning "infinity") in the 17th century, and it may be derived from the Roman numeral for "one thousand" CIƆ, or alternatively from the final Greek letter, ω.

The numeral eight in Greek numerals, developed in Classical Greece by the 5th century BC, was written as Η, the eighth letter of the Greek alphabet.

The Chinese numeral eight is written in two strokes, 八; the glyph is also the 12th Kangxi radical.

In science

Physics

Astronomy

Chemistry

Geology
  • A disphenoid crystal is bounded by eight scalene triangles arranged in pairs. A ditetragonal prism in the tetragonal crystal system has eight similar faces whose alternate interfacial angles only are equal.

Biology
  • All spiders, and more generally all arachnids, have eight legs.[22] Orb-weaver spiders of the cosmopolitan family Areneidae have eight similar eyes.[23]
  • The octopus and its cephalopod relatives in genus Argonauta have eight arms (tentacles).
  • Compound coelenterates of the subclass or order Alcyonaria have polyps with eight-branched tentacles and eight septa.[24]
  • Sea anemones of genus Edwardsia have eight mesenteries.[25]
  • Animals of phylum Ctenophora swim by means of eight meridional bands of transverse ciliated plates, each plate representing a row of large modified cilia.[26]
  • The eight-spotted forester (genus Alypia, family Zygaenidae) is a diurnal moth having black wings with brilliant white spots.
  • The ascus in fungi of the class Ascomycetes, following nuclear fusion, bears within it typically eight ascospores.[27]
  • Herbs of genus Coreopsis (tickseed) have showy flower heads with involucral bracts in two distinct series of eight each.
  • In human adult dentition there are eight teeth in each quadrant.[28] The eighth tooth is the so-called wisdom tooth.
  • There are eight cervical nerves on each side in man and most mammals.[29]

In Psychology

In technology
NATO signal flag for 8

In measurement

In culture

Architecture
  • Various types of buildings are usually eight-sided (octagonal), such as single-roomed gazebos and multi-roomed pagodas (descended from stupas; see religion section below).
  • Eight caulicoles rise out of the leafage in a Corinthian capital, ending in leaves that support the volutes.

In religion, folk belief and divination

Hinduism

Buddhism
In Buddhism, the 8-spoked Dharmacakra represents the Noble Eightfold Path
  • The Dharmacakra, a Buddhist symbol, has eight spokes.[43] The Buddha's principal teaching—the Four Noble Truths—ramifies as the Noble Eightfold Path and the Buddha emphasizes the importance of the eight attainments or jhanas.
  • In Mahayana Buddhism, the branches of the Eightfold Path are embodied by the Eight Great Bodhisattvas: (Manjusri, Vajrapani, Avalokiteśvara, Maitreya, Ksitigarbha, Nivaranavishkambhi, Akasagarbha, and Samantabhadra).[44] These are later (controversially) associated with the Eight Consciousnesses according to the Yogacara school of thought: consciousness in the five senses, thought-consciousness, self-consciousness, and unconsciousness-"consciousness" or "store-house consciousness" (alaya-vijñana). The "irreversible" state of enlightenment, at which point a Bodhisattva goes on "autopilot", is the Eight Ground or bhūmi. In general, "eight" seems to be an auspicious number for Buddhists, e.g., the "eight auspicious symbols" (the jewel-encrusted parasol; the goldfish (always shown as a pair, e.g., the glyph of Pisces); the self-replenishing amphora; the white kamala lotus-flower; the white conch; the eternal (Celtic-style, infinitely looping) knot; the banner of imperial victory; the eight-spoked wheel that guides the ship of state, or that symbolizes the Buddha's teaching). Similarly, Buddha's birthday falls on the 8th day of the 4th month of the Chinese calendar.

Judaism

Christianity

Islam

Taoism

Other

As a lucky number
  • The number eight is considered to be a lucky number in Chinese and other Asian cultures.[57] Eight (八; accounting 捌; pinyin bā) is considered a lucky number in Chinese culture because it sounds like the word meaning to generate wealth (發(T) 发(S); Pinyin: fā). Property with the number 8 may be valued greatly by Chinese. For example, a Hong Kong number plate with the number 8 was sold for $640,000.[58] The opening ceremony of the Summer Olympics in Beijing started at 8 seconds and 8 minutes past 8 pm (local time) on 8 August 2008.[59]
  • Eight (八, hachi, ya) is also considered a lucky number in Japan, but the reason is different from that in Chinese culture.[60] Eight gives an idea of growing prosperous, because the letter (八) broadens gradually.
  • The Japanese thought of eight (や, ya) as a holy number in the ancient times. The reason is less well-understood, but it is thought that it is related to the fact they used eight to express large numbers vaguely such as manyfold (やえはたえ, Yae Hatae) (literally, eightfold and twentyfold), many clouds (やくも, Yakumo) (literally, eight clouds), millions and millions of Gods (やおよろずのかみ, Yaoyorozu no Kami) (literally, eight millions of Gods), etc. It is also guessed that the ancient Japanese gave importance to pairs, so some researchers guess twice as four (よ, yo), which is also guessed to be a holy number in those times because it indicates the world (north, south, east, and west) might be considered a very holy number.
  • In numerology, 8 is the number of building, and in some theories, also the number of destruction.

In astrology

In music and dance
  • A note played for one-eighth the duration of a whole note is called an eighth note, or quaver.[62]
  • An octave, the interval between two musical notes with the same letter name (where one has double the frequency of the other), is so called because there are eight notes between the two on a standard major or minor diatonic scale, including the notes themselves and without chromatic deviation.[63] The ecclesiastical modes are ascending diatonic musical scales of eight notes or tones comprising an octave.
  • There are eight notes in the octatonic scale.
  • There are eight musicians in a double quartet or an octet.[64] Both terms may also refer to a musical composition for eight voices or instruments.[65]
  • Caledonians is a square dance for eight, resembling the quadrille.
  • Albums with the number eight in their title include 8 by the Swedish band Arvingarna, 8 by the American rock band Incubus,[66] The Meaning of 8 by Minnesota indie rock band Cloud Cult and 8ight by Anglo-American singer-songwriter Beatie Wolfe.[67]
  • Dream Theater's eighth album Octavarium contains many different references to the number 8, including the number of songs and various aspects of the music and cover artwork.
  • "Eight maids a-milking" is the gift on the eighth day of Christmas in the carol "The Twelve Days of Christmas".[68]
  • The 8-track cartridge is a musical recording format.
  • "#8" is the stage name of Slipknot vocalist Corey Taylor.
  • "Too Many Eights" is a song by Athens, Georgia's Supercluster.[69]
  • Eight Seconds, a Canadian musical group popular in the 1980s with their most notable song "Kiss You (When It's Dangerous)".[70]
  • "Eight Days a Week" is a #1 single for the music group The Beatles.[71]
  • Figure 8 is the fifth studio album by singer-songwriter Elliott Smith, released in the year 2000,[72] an album released by Julia Darling in 1999,[73] and an album released by Outasight in 2011.[74]
  • Ming Hao from the k-pop group Seventeen goes by the name "The8".[75]
  • "8 (circle)" is the eighth song on the album 22, A Million by the American band Bon Iver.[76]
  • "8" is the eighth song on the album When We All Fall Asleep, Where Do We Go? by Billie Eilish.[77]

In film and television

In sports and other games
An 8-ball in pool
  • Eight-ball pool is played with a cue ball and 15 numbered balls, the black ball numbered 8 being the middle and most important one, as the winner is the player or side that legally pockets it after first pocketing its numerical group of 7 object balls (for other meanings see Eight ball (disambiguation)).
  • In chess, each side has eight pawns and the board is made of 64 squares arranged in an eight by eight lattice. The eight queens puzzle is a challenge to arrange eight queens on the board so that none can capture any of the others.
  • In the game of eights or Crazy Eights, each successive player must play a card either of the same suit or of the same rank as that played by the preceding player, or may play an eight and call for any suit. The object is to get rid of all one's cards first.
  • In association football, the number 8 has historically been the number of the Central Midfielder.
  • In Australian rules football, the top eight teams at the end of the Australian Football League regular season qualify for the finals series (i.e. playoffs).
  • In baseball:
  • In rugby union, the only position without a proper name is the Number 8, a forward position.
  • In rugby league:
    • Most competitions (though not the Super League, which uses static squad numbering) use a position-based player numbering system in which one of the two starting props wears the number 8.
    • The Australia-based National Rugby League has its own 8-team finals series, similar but not identical in structure to that of the Australian Football League.
  • In rowing, an "eight" refers to a sweep-oar racing boat with a crew of eight rowers plus a coxswain.[87]
  • In the 2008 Games of the XXIX Olympiad held in Beijing, the official opening was on 08/08/08 at 8:08:08 p.m. CST.
  • In The Stanley Parable Demonstration, there is an eight button that, when pressed, says the word eight.
  • In Mario Kart:
    • The Crazy Eight item in Mario Kart 8 allows the player to use eight items at once.
    • The number of characters in the starting grid in most games except for Mario Kart Wii and Mario Kart 8.

In foods
  • Nestlé sells a brand of chocolates filled with peppermint-flavoured cream called After Eight, referring to the time 8 p.m.[88]
  • There are eight vegetables in V8 juice.

In literature
  • Eights may refer to octosyllabic, usually iambic, lines of verse.
  • The drott-kvaett, an Old Icelandic verse, consisted of a stanza of eight regular lines.[89]
  • In Terry Pratchett's Discworld series, eight is a magical number[90] and is considered taboo. Eight is not safe to be said by wizards on the Discworld and is the number of Bel-Shamharoth. Also, there are eight days in a Disc week and eight colours in a Disc spectrum, the eighth one being octarine.
  • Lewis Carroll's poem The Hunting of the Snark has 8 "fits" (cantos), which is noted in the full name "The Hunting of the Snark – An Agony, in Eight Fits."[91]
  • Eight apparitions appear to Macbeth in Act 4 scene 1 of Shakespeare's Macbeth as representations of the eight descendants of Banquo.

In slang
  • An "eighth" is a common measurement of marijuana, meaning an eighth of an ounce. It is also a common unit of sale for psilocybin mushrooms. Also, an eighth of an ounce of cocaine is commonly referred to as an "8-ball."[92]
  • The numeral "8" is sometimes used in informal writing and Internet slang to represent the syllable "ate", as in writing "H8" for "hate", or "congratul8ions" for "congratulations". Avril Lavigne's song "Sk8er Boi" uses this convention in the title.
  • "Section 8" is common U.S. slang for "crazy", based on the U.S. military's Section 8 discharge for mentally unfit personnel.
  • The Housing Choice Voucher Program, operated by the United States Department of Housing and Urban Development, is commonly referred to as the Section 8 program, as this was the original section of the Act which instituted the program.[93]
  • In Colombia and Venezuela, "volverse un ocho" (meaning to tie oneself in a figure 8) refers to getting in trouble or contradicting oneself.
  • In China, "8" is used in chat speak as a term for parting. This is due to the closeness in pronunciation of "8" (bā) and the English word "bye".
gollark: That would be me/
gollark: Well, then see what in that line is doing it.
gollark: These exceptions SHOULD come with a line and file.
gollark: Which line does it say?
gollark: Nulls are, you see, evil.

See also

References
  1. Weisstein, Eric W. "Octal". mathworld.wolfram.com. Retrieved 7 August 2020.
  2. Bryan Bunch, The Kingdom of Infinite Number. New York: W. H. Freeman & Company (2000): 88
  3. Weisstein, Eric W. "Deltahedron". mathworld.wolfram.com. Retrieved 7 August 2020.
  4. Weisstein, Eric W. "Octagon". mathworld.wolfram.com. Retrieved 7 August 2020.
  5. Weisstein, Eric W. "Octahedron". mathworld.wolfram.com. Retrieved 7 August 2020.
  6. Weisstein, Eric W. "Cuboctahedron". mathworld.wolfram.com. Retrieved 7 August 2020.
  7. Weisstein, Eric W. "Cube". mathworld.wolfram.com. Retrieved 7 August 2020.
  8. Weisstein, Eric W. "Sphenic Number". mathworld.wolfram.com. Retrieved 7 August 2020. ...then every sphenic number n=pqr has precisely eight positive divisors
  9. Lounesto, Pertti (3 May 2001). Clifford Algebras and Spinors. Cambridge University Press. p. 216. ISBN 978-0-521-00551-7. ...Clifford algebras, contains or continues with two kinds of periodicities of 8...
  10. Inc, Boy Scouts of America (1931). Boys' Life. Boy Scouts of America, Inc. p. 20. lunge forward upon this skate in a left outside forward circle, in just the reverse of your right outside forward circle, until you complete a figure 8.
  11. Day, Cyrus Lawrence (1986). The Art of Knotting & Splicing. Naval Institute Press. p. 231. ISBN 978-0-87021-062-4. To make a line temporarily fast by winding it , figure - eight fashion , round a cleat , a belaying pin , or a pair of bitts.
  12. Etymological Dictionary of Turkic Languages: Common Turkic and Interturkic stems starting with letters «L», «M», «N», «P», «S», Vostochnaja Literatura RAS, 2003, 241f. (altaica.ru Archived 31 October 2007 at the Wayback Machine)
  13. the hypothesis is discussed critically (and rejected as "without sufficient support") by Werner Winter, 'Some thought about Indo-European numerals' in: Jadranka Gvozdanović (ed.), Indo-European Numerals, Walter de Gruyter, 1992, 14f.
  14. Georges Ifrah, The Universal History of Numbers: From Prehistory to the Invention of the Computer transl. David Bellos et al. London: The Harvill Press (1998): 395, Fig. 24.68.
  15. Ilangovan, K. (10 June 2019). Nuclear Physics. MJP Publisher. p. 30.
  16. Gell-Mann, M. (15 March 1961). "THE EIGHTFOLD WAY: A THEORY OF STRONG INTERACTION SYMMETRY". Cite journal requires |journal= (help)
  17. Baxter, R. J. (5 April 1971). "Eight-Vertex Model in Lattice Statistics". Physical Review Letters. 26 (14): 832–833. doi:10.1103/PhysRevLett.26.832.
  18. "Messier Object 8". www.messier.seds.org. Retrieved 7 August 2020.
  19. Thomas, Mary Ann (15 August 2004). Oxygen. The Rosen Publishing Group, Inc. p. 12. ISBN 978-1-4042-0159-0. Knowing that oxygen has an atomic number of 8,
  20. Choppin, Gregory R.; Johnsen, Russell H. (1972). Introductory chemistry. Addison-Wesley Pub. Co. p. 366. under normal conditions the most stable allotropic form (Fig. 23-8a). Sulfur molecules within the crystal consist of puckered rings of eight sulfur atoms linked by single...
  21. Puri, Basant; Hall, Anne (16 December 1998). Phytochemical Dictionary: A Handbook of Bioactive Compounds from Plants, Second Edition. CRC Press. p. 810. ISBN 978-0-203-48375-6. The chemical structure of lycopene consists of a long chain of eight isoprene units joined head to tail
  22. Parker, Barbara Keevil (28 December 2006). Ticks. Lerner Publications. p. 7. ISBN 978-0-8225-6464-5. Arachnids have eight legs
  23. Jackman, J. A. (1997). A Field Guide to Spiders & Scorpions of Texas. Gulf Publishing Company. p. 70. ISBN 978-0-87719-264-0. Araneids have eight eyes
  24. Fisher, James; Huxley, Julian (1961). The Doubleday Pictorial Library of Nature: Earth, Plants, Animals. Doubleday. p. 311. Polyps with eight branched tentacles and eight septa
  25. Chisholm, Hugh (1910). The Encyclopædia Britannica: A Dictionary of Arts, Sciences, Literature and General Information. At the University Press. p. 100. ...whether all the eight mesenteries of Edwardsia are developed simultaneously...
  26. The Century Dictionary and Cyclopedia: A work of Universal Reference in all Departments of Knowledge with a New Atlas of the World. 1906. p. 1384. ...are radially symmetrical, and swim by means of eight meridional ciliated bands, ...
  27. Parrish, Fred K. (1975). Keys to Water Quality Indicative Organisms of the Southeastern United States. Environmental Protection Agency, Office of Research and Development, Environmental Monitoring and Support Laboratory, Biological Methods Branch, Aquatics Biology Section. p. 11. ... the ascospores, are borne in sac like structures termed asci. The ascus usually contains eight as cospores,...
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