A page of the Numeropedia - the Special Encyclopedia of Numbers
[Astronomy] The number of planets in the Solar System (listed from the nearest to the Sun): Mercury (8th largest by diameter), Venus (6th), Earth (5th), Mars (7th), Jupiter (1st), Saturn (2nd), Uranus (3rd) and Neptune (4th), as of August 24, 2006, after the International Astronomical Union voted to demote the 9th planet Pluto (discovered in 1930) to “dwarf planet” and it was assigned the asteroid number 134340 by the Minor Planet Center.
[Astronomy] The average time interval (8 minutes 19 seconds) for the sunlight from the Sun to reach the Earth.
[Biology] Animals/insects having 8 legs: spiders, scorpions, ticks… Most 8-leg animals are called arachnids.
[Calendar] October was meant the 8th month in Latin.
[Calendar] The year 8 A.D. (not 4 A.D.) was the first leap year in the first century, to correct the past mistakes, having leap years for every 3 years (since the year 45 B.C. to 9 B.C.) instead of 4 years as decreed by Julius Caesar in 46 B.C.
[Calendar] August’s birthstone is peridot or sardonyx (for friendship).
August’s flower is poppy or gladiolus (gladiola). August’s full moon is named “Sturgeon Moon”.
August’s full moon is named “Sturgeon Moon”.
[Chemistry] The atomic number of Oxygen (O).
[Chemistry] The number of electrons that can reside in a shell is 2n2, i.e., 2, 8, 18, 32, 50, 72 and 98.
[Education] The number of universities/colleges in the Ivy League: Brown, Columbia, Cornell, Dartmouth, Harvard, Princeton, University of Pennsylvania and Yale.
[EECS] The digit represented by the gray color by either first 2 bands or the exponent of 10 represented by that color of the 3rd band (i.e. multiplier is 108) in the electronic resistor/capacitor color code.
[EECS] The number of bits in a byte. The number of nibbles in a doubleword. 1 doubleword = 2 words = 4 bytes = 8 nibbles = 32 bits.
[EECS] The number of bits in an octet.
[Flag] The number of stars on the Alaska state flag: 7 stars of the Big Dipper (Ursa Major) and the North Star (largest).
[Flag] The number of yellow rays extending from the centered yellow sun to the edges of the red field on the national flag of Macedonia.
[Flag] The number of triangular points of the serrated white band, along the hoist-side, on the national flag of Bahrain.
[Flag] The number of primary sunrays (each containing 3 individual rays), radiated from the yellow sun, in the white equilateral triangle based on the hoist side, on the national flag of Philippines.
[Game] The number of Pawns for each player/side in a chess set.
[Game] The number of possible directions that a King or a Queen can move in a chess game.
The number of possible positions to which a Knight (Horse) can move in a chess (or a Chinese chess) game.
[Game] The size of a chessboard or a checkerboard is 8´8.
[Game] In the 8-ball pool, only the 8-ball is black.
[Game] The number of Pa-kua symbols/markings in the Korean/Chinese trigrams, in exact orders: heaven, steam, fire, thunder, wind, water, mountain and earth. Each trigram combines of 3 piled lines, broken or unbroken: heaven (0, all 3 unbroken lines), steam (1, one broken line on top), until earth (7, all 3 broken lines), respectively, as counting in the binary number system.
[Language] Prefixes: Oct-…
[Language] The number to replace the letters or word “ate” in slang English, such as: “Seven Ate Nine”.
[Language] The first (even) number in the list of numbers sorted by the English alphabetical order: eight; the first odd number is 8,808,808,885 and the first prime is: 8,808,808,889.
[Language] “Two cubed” has 8 letters. Hence it is an honest number.
[Language] Tween (or pre-teen) refers to a child between middle childhood and adolescence, generally in the age range of 8 to 12 years old
[Language & Math.] The first numbers in the list of numbers sorted by the English alphabetical order are: eight (8), eight billion (8,000,000,000), eight billion eight (8,000,000,008), eight billion eight hundred (8,000,000,800), eight billion eight hundred eight (8,000,000,808)… (See also Numbers 8,800,000,000s and 8,000,000,000s). (References )
[Library] The number of digits in the ISSN (International Standard Serial Number for periodicals and magazines). The sum of 8 products (n times the nth digit from the right of an ISSN, for n = 1 to 10) must be divisible by 11. The check digit (1st) can be X, standing for 10.
[Literature] “Xiangjiang Eight Scenic Wonders” are the memorable pieces of arts from the Xiangjiang River of China.
[Literature] Eight Chinese Immortals & their sacred weapons: Chang Ko-Lao (on donkey with stick) – Ch’üan Chung-Li (fan) – Han Hsiang (flute) – Ho Hsien-Ku (magic lotus flower) – Lan Ts’ai-Ho (basket of flowers) – Li T’ieh-Kuai (gourd & bat) – Lü Tung-Pin (sword) – Ts’ao Kuo-Chiu (castanets).
[Medical] The number of types of human blood, considered the Rhesus factor: O+, O–, A+, A–, B+, B–, AB+ and AB–. That is 4 main blood groups (O, A, B and AB) and 2 Rhesus factor (+ or –) for each group. Type O– is the universal donor. Type AB+ is universal recipient.
[Money] The number of digits of the serial number of newly designed U.S. Federal Reserve Notes (or paper currency bills), together with 2 prefix letters and one suffix letter.
[Money] “Piece of Eight” means old Spanish coin.
[Movie] Names of TV shows/series or movies: “8mm”, “8 Mile”, “Eight Crazy Nights”, “Eight Men Out”, “8 Simple Rules for Dating My Teenage Daughter”, “8 Heads in a Duffel Bag”, “8 Women”, “8 Days to Live”, “Eight Below”, “Jon & Kate Plus 8” and “Section 8”.
[Phone] The digit that can be dialed mnemonically by either letter T, U or V on the telephone keypad.
[Phone] The number to key in text messaging on telephone keypad for letter V.
[Theology] The number of spokes on the wheel symbol of Buddhism.
[Theology] The number of arms of the god Vishnu, corresponding to the eight guardians of space.
[Trivia] Super 8, name of a popular chain of motels.
[Trivia] Pack of bread bunches has 8 bunches.
[Trivia] The regular number of hours per day for a full-time working schedule.
[Trivia] The 8th wedding anniversary is traditionally named bronze (or pottery, rubber) anniversary. Modernly, it may be replaced by laces/linens (or tourmaline).
[Trivia] The number of brushstrokes in name of the automobile maker “Toyota” (in Japanese characters) is eight; it was considered luckier than the real family name “Toyoda” of the founder with 10 brushstrokes.
[Trivia] Morse code for number 8 is 3 dashes and 2 dots [ _ _ _ . . ]
Flag semaphore signal for number 8 is that of letter H.
[World] Group of Eight (G-8) comprises of the (G-7) Group of Seven countries (Canada, France, Germany, Italy, Japan, the United Kingdom and the U.S.) together with Russia (at the 1997 Denver, Colorado, “Summit of the Eight”).
[World] The ISO country code for Albania is 008. (ISO-3166)
[EECS] 8.2(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%).
[Movie] Name of TV show/series or movie: “8½”.
[Trivia] The shorter side (mm, millimeters) of the U.S. standard paper size “Letter” (279 mm×216 mm or 11 in×8.5 in), comparable to the international standard paper size A4 (297 mm×210 mm). The shorter side (inches) of the U.S. standard paper size “Legal” (356 mm×216 mm or 14 in×8.5 in).