The 80 (number) reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

80 (number)

80 is the natural number following 79 and preceding 81. It is a Harshad number.

List of numbers — Integers << 80 81 82 83 84 85 86 87 88 89 >>
Cardinal	eighty
Ordinal	eightieth
Numeral system	octagesimal
Factorization
Divisors	2, 4, 5, 8, 10, 16, 20, 40
Roman numeral	LXXX
Binary	01010000
Hexadecimal	50

• Greek numeral: π´
• See to see 80 in other languages.

Eighty is also:

• the atomic number of mercury (Hg)
• the number of units in a fourscore
• the age at which one becomes an octogenarian
• in the title of Around the World in Eighty Days by Jules Verne
• the model number of the computers TRS-80, IBM 80, Sinclair ZX80, and Aster CT-80
• the model number of T-80, a Soviet tank; IAR 80, a Romanian WWII fighter aircraft; and McDonnell Douglas MD-80, Arado Ar 80, and F-80 Shooting Star
• part of the name of the bands Eighty-D and Eighty Proof Soul
• the age limit for cardinals to vote in papal elections
• the percentage of work done with 20% of the resources according to a "80/20 rule"
• the length of a beach in Western Australia: Eighty Mile Beach
• the length of the Eighty Years' War or Dutch revolt (1568-1648)
• the number of the French department Somme
• the designation of Interstate 80, a freeway that runs from California to New Jersey; the European route E80 from Lisbon to Gürbulak
• the standard TCP/IP port number for HTTP connection
• the 80A, 80B and 80C photographic filters correct for excessive redness under tungsten lighting
• The year AD 80, 80 BC, or 1980.

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