Ar

AR, Ar or ar can mean:

AR

Abandoned Realms[link], a mud(Multi User Dungeon) in which roleplay(RP) is enforced and playerkilling(PK) is strongly encouraged
Aberdeen and Rockfish Railroad, (AAR reporting mark
Accelerated Reader, educational reading assessment software
Accounts Receivable, an accounting term
Acoustic Research, a brand name of Audiovox
Action Replay, Video game device
Activation record, a computer science term for the set of data regarding an active subroutine, stored within the stack.
Aerolíneas Argentinas, IATA airline designator
Animal Rights, among animal rights activists
Appenzell Outer Rhodes, Swiss canton
Argentina, ISO and FIPS 10-4 digram country code
The Arizona Republic, a newspaper published in Phoenix, Arizona
Arkansas, state postal code
Armalite, an American arms manufacturer (e.g. AR-15 or any rifle of the same pattern)
Augmented reality, an opposite of virtual reality
Autoregressive, stochastic process in Econometrics
Repair Ship, U.S. Navy hull classification symbol
Silver, in the field of numismatics (from the Latin Argentum)
Artificial Respiration, a cardio-respratory technique for lifesaving.

See also: .ar (the ccTLD for Argentina).

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