AR
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AR can mean:
- Appenzell Outer Rhodes (Swiss canton)
- Argentina (ISO 3166-1 alpha-2 country code)
- Arkansas (state code)
- the US Navy hull classification symbol for Repair Ship
- Aberdeen and Rockfish Railroad (AAR reporting mark AR)
- Autoregressive (Stochastic process in Econometrics)
- the IATA code for Aerolineas Argentinas
- an AR-15 or any rifle of the same pattern.
- The AR in AR-15 stands for Armalite, an American arms manufacturer.
See also: Ar
de:AR