Anorexia Nervosa, an eating disorder

Angola's World Meteorological Organization country code

Andorra's obsolete NATO country code

Netherlands Antilles' ISO country code

A_n, a Dynkin diagram

Ansett Australia's now defunct IATA airline designator

AN, ammonium nitrate

Alleanza Nazionale, the Italian name for the National Alliance (Italy), a political party in Italy

Astronomische Nachrichten, or Astronomical Notes, an international Astronomy journal

Anderson County, Kansas state county code

Aragonese language's ISO 639-1:2002 language code

Anime North, a Canadian anime convention

An (mythology), a god in Sumerian mythology

a prefix used by by the U.S. military for electronic equipment named under the Joint Electronics Type Designation System

An is the indefinite article in English; see a and an. An, AN, aN, or an may also refer to:

the romanization of the Japanese word 餡, meaning red bean paste

Apalachicola Northern Railroad's Association of American Railroads reporting mark

The design office prefix for Antonov, a Ukrainian (formerly Soviet) aircraft manufacturing and services company

Anguttara Nikaya, one of the five oldest books in Buddhist literature

An alternative romanisation for Ahn (Korean name)

acetonitrile

Application Note Application Note (in engineering) most often seen as A.N.

AN thread, a type of fitting

Avisa Nordland, a Norwegian newspaper

An (Shintō), a small table or platform used during Shinto ceremonies

An (Chinese name)

AN (band), a Finnish black metal band

An (goddess), a goddess in Sumerian mythology

aN, the attonewton, an SI unit of force