81 may refer to:
*
81 (number)
81 (eighty-one) is the natural number following 80 and preceding 82.
In mathematics
81 is:
* the square of 9 and the fourth power of 3.
* a perfect totient number like all powers of three.
* a heptagonal number.
* a centered octagonal numbe ...
* one of the years
81 BC,
AD 81,
1981
Events January
* January 1
** Greece enters the European Economic Community, predecessor of the European Union.
** Palau becomes a self-governing territory.
* January 10 – Salvadoran Civil War: The FMLN launches its first major offensiv ...
,
2081
In contemporary history, the third millennium of the anno Domini or Common Era in the Gregorian calendar is the current millennium spanning the years 2001 to 3000 (21st to 30th centuries). Ongoing futures studies seek to understand what is li ...
* Nickname for the
Hells Angels Motorcycle Club. "H" is the eighth letter of the alphabet, and "A" is the first.
See also
*
*
List of highways numbered
A ''list'' is any set of items in a row. List or lists may also refer to:
People
* List (surname)
Organizations
* List College, an undergraduate division of the Jewish Theological Seminary of America
* SC Germania List, German rugby union ...
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