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See also: Appendix:Variations of "ar"
AR (not comparable)
- (statistics) Initialism of .
- (countable) an AR-15 personal semi-automatic rifle, M-16 assault rifle, M-4 carbine, derivative or related gun
- (accounting, uncountable or plural only) Initialism of .
- (sports, countable) area record: best achievement among those by persons from a given continent
- Initialism of .
- (computing, chiefly uncountable) Initialism of .
- (countable) Initialism of .
- (fan fiction) alternate reality
- (meteorology) Initialism of .
- (emergency medicine) Initialism of .
- (philately, postal service) Initialism of .
- (gun): AK
- Postal abbreviation of
- (Arkansas): Ark. (standard, not postal, abbreviation)