8th

8

−1 0 1 2 3 4 5 6 7 8 9 →

List of numbers — Integers

← 0 10 20 30 40 50 60 70 80 90 →

eight

8th
(eighth)

2³

1, 2, 4, 8

VIII

Roman numeral (unicode)

Ⅷ, ⅷ

/

/

1000₂

22₃

20₄

13₅

12₆

10₈

8₁₂

8₁₆

8₂₀

8₃₆

η (or Η)

Arabic & Kurdish

٨

፰

৮

Chinese numeral

八，捌

८

೮

౮

௮

ח (Het)

שמונה (shmoneh)

៨

팔

๘

Ը ը (ett)

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

8 is:

A number is divisible by 8 if its last 3 digits, when written in decimal, are also divisible by 8, or its last 3 digits are 0 when written in binary.

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

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

A cube has eight vertices.

Sphenic numbers always have exactly eight divisors.

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 lattice 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. Figure-eight turns of a rope or cable around a cleat, pin, or bitt are used to belay something.

English eight, from Old English eahta, æhta, Proto-Germanic *ahto is a direct continuation of Proto-Indo-European , and as such cognate with Greek ὀκτώ and Latin octo-, both of which stems are reflected by the English prefix , 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 sibling delivered in one birth.

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Wikipedia

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