Abbreviations beginning with a

ABUAlpha Beta Unlimited (gaming, Magic: The Gathering)
Miscellaneous

ABUAlways Bloody Useless
Miscellaneous » Funnies

ABUAnyone But United (soccer)
Miscellaneous

ABUAsia-Pacific Broadcasting Union
Miscellaneous

ABUAssociation des Bibliophiles Universels
Miscellaneous » Unclassified

ABUAtlantic Baptist University (Moncton, New Brunswick, Canada)
Miscellaneous

ABUAfrican Boxing Union
Regional » African

ABU1Aviation Boatswain's Mate ((utility)) Petty Officer 1st Class
Governmental » Navy

ABU2Aviation Boatswain's Mate (utility) Petty Officer 2nd Class
Governmental » Navy

ABU3Aviation Boatswain's Mate (utility) Petty Officer 3rd Class
Governmental » Navy

ABUAAmateur Baseball Umpires Association
Miscellaneous

ABUAAAviation Boatswain's Mate (utility) Airman Apprentice
Governmental » Navy

ABUADAfe Babalola University, Ado-Ekiti - Ekiti State
Academic & Science

ABUANAviation Boatswain's Mate (utility) Airman
Governmental » Navy