8 (number)
Category:Integers\n
8 (
eight) is the
natural number following
7 and preceding
9.
In mathematics
\nIt is a composite number, its proper divisors being
1,
2, and
4.\nEight is a
power of two, being 2
3, or two cubed.
8 is the base of the
octal number system, which is mostly used with
computers. In octal, one digit represents three
bits.
The number 8 is a
Fibonacci number, being
3 plus
5. The next Fibonacci number is
13.
In
binary code eight is 1000; in
ternary code eight is 22; in
quaternary numeral system code eight is 20; in
quinary eight is 13; in
senary eight is 12; in
septenary eight is 11; in
octal eight is 10; in
novenary code and all codes above (such as
decimal and
hexadecimal) eight is 8. In
Roman numerals eight is VIII.
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.
In other fields
\n*The atomic number of
oxygen\n*The second
Magic number (physics).\n*In
particle physics, the eightfold way is used to classify sub-atomic particles.\n*Eight (八, formal writing 捌,
pinyin ba1) is considered a
lucky number in
Chinese culture because it sounds like the word "prosper" (發
pinyin fa1).\n*There are eight musicians in an
octet.\n*Eight babies delivered in one birth are called octuplets. The first set of eight surviving babies, the
Louis-Chukwu Octuplets, were born in 1998.\n*All
spiders, and more generally all
arachnids, have eight legs. An
octopus has eight tentacles.\n*In
Buddhism, the
Eightfold Path is the way to spiritual progress.\n*
Timothy Leary identified a hierarchy of eight levels of consciousness.\n*The
wheel of life has eight spokes.\n*
October was the eighth month in the Roman calendar,
August is currently the eighth month.\n*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.\n*Referring to the shape of the numeral, eight was represented in
bingo slang, before
political correctness, as 'One Fat Lady.' Eighty-eight was 'Two Fat Ladies'. \n*
Eight ball billiards is played with 15 balls; the black ball numbered 8 is the most important one. Eight-balls are often sold as fortune-telling devices.\n*"Eight maids a-milking" is the gift on the eighth day of Christmas in the "Twelve days of Christmas" carol.\n*
I-8 is the designation of the
US interstate highway that runs from
San Diego, California to
Casa Grande, Arizona.\n*There are eight categories of political ideology on a
Vosem Chart, which gets its name from
восемь, the
Russian word for eight, or on a Friesian Cube (see
political spectrum). Eight is also the number of categories the VALS system uses to classify consumer groups, and the number of categories used by Fallon-McElligott's system for teen marketing.\n*There is a brand of chocolate called "After Eight", referring to the time 8 p.m.\n*There are eight vegetables in
V8 juice.\n*The number on
Walt Disney's Herbie adds up to eight.\n*Using
hyperbole, the
Beatles sang about loving their addressee "Eight Days a Week". Also from music is the
8-track.\n*A note played for one-eighth the duration of a whole note is called an
eight note, or
quaver.\n*The numeral "8" is sometimes used in writing to represent the syllable "ate", as in writing "H8" for "hate", or "congratul8ons" for "congratulations".
Avril Lavigne's song "Sk8er Boi" uses this convention in the title.\n*Several groups of "
Eight Immortals"\n*
Eight Principles of Yong\n*
War of the Eight Princes\n*In
chess, each side has eight pawns; see also
Eight queens puzzle\n* In
rugby union the number eight central back row position wears the 8 shirt.\n*Historical years:
8 A.D.,
8 B.C, or
1908
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