AN is:

• The obsolete NATO digram for Andorra
• The IATA code for Ansett Australia (now defunct)
• A prefix in Army-Navy Equipment Code Designators
• The AAR reporting mark for Apalachicola Northern Railroad
• The ISO country code for the Netherlands Antilles
• An occasional abbreviation of ammonium nitrate
• A common abbreviation for National Alliance (Italian: Alleanza Nazionale), a political party in Italy
• The state county code for Anderson County, Kansas
• A type of fitting, AN thread

An is:

• An indefinite article in the English language; see A, an
• The god An in Sumerian mythology
• A Chinese name
  • The personal name of Dr. An Wang, the Chinese American computer engineer, inventor, and co-founder of Wang Laboratories
  • The surname An
• A Korean family name also romanized Ahn.
• The romanization (rōmaji) of the Japanese word for sweet bean paste
• An abbreviation for the Ukrainian Antonov design bureau

aN is:

• The attonewton, an SI unit of force

an is:

• The ISO 639-1:2002 code for Aragonese language
• An abbrevation for the Norwegian newspaper Avisa Nordland

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