United Nations Abbreviations and Acronyms
- AAArakan Army
- AAAanti-aircraft artillery "Triple A"
- AAFAnti American Faction
- ABCA Bunch of Communists
- ABCDAnother Bad China Day
- ABNJAreas Beyond National Jurisdiction
- ABSAccess and Benefit Sharing
- ABSAir Breathing System
- ABSIEAmerican Broadcasting Station in Europe
- ACArmed Constabulary
- ACBCAfrican Capacity Building Centre
- ACCAdministrative Committee on Coordination
- ACCORDAustrian Centre for Country of Origin and Asylum Research and Documentation
- ACHArchaeological Cultural Heritage
- ACHRAsian Coalition for Housing Rights
- ADBAsian Development Bank
- ADOAdministrative Duty Officer
- AFEJAsian Forum of Environmental Journalists
- AFICSAssociation of Former International Civil Servants
- AFNORTHAir Force North; Allied Forces Northern Europe (NATO)
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