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See also: Appendix:Variations of "ma"
- (metrology) Symbol for megaampere, an SI unit of electrical current equal to 106 amperes.
- The ISO 3166-1 two-letter (alpha-2) code for Morocco.
MA (not comparable)
- (statistics) Initialism of .
- Initialism of .
- (US, television) Initialism of , a television rating.
- (US, military) Initialism of ; also MAA.
- Postal abbreviation of , a state of the United States of America.
- Maluku, a province of Indonesia.
- Maranhão, a state of Brazil.
- Abbreviation of : BB.
- Abbreviation of . (Brazilian state)