Abbreviations beginning with a

ABTMAceto Balsamico Tradizionale di Modena (Italian: Traditional Balsamic Vinegar of Modena)
Business

ABTNAir and Business Travel News (London, England, UK; website)
Academic & Science

ABTNAssociação Brasileira de Normas Técnicas (Brazilian Association of Technical Norms)
Academic & Science

ABTOAbert's Towhee (bird species)
Academic & Science

ABTOAmerican Board of Otolaryngology (Houston, TX)
Academic & Science

ABTOApplied Business Technology Online (certification program; Canada)
Academic & Science

ABTOAssociation of Belgian Tour Operators (est. 1973)
Academic & Science

ABTOAssociation of Basic Telecom Operators
Miscellaneous

ABTOAssociation of British Tennis Officials
Miscellaneous

ABTOTAssociation of Bonded Travel Organisers Trust Ltd (UK)
Miscellaneous

ABTPAdvanced Biomedical Technology Program
Academic & Science

ABTPAlliance of Black Telecommunications Professionals
Academic & Science

ABTPAmerican Board of Transcultural Psychiatry
Academic & Science

ABTPWatervliet Arsenal Business and Technology Partnership
Business » Companies & Firms

ABTPAddress Book Transport Protocol
Computing » Networking

ABTPAbsentee Ballots, Tabulation by Precinct
Governmental » Politics

ABTPWatervliet Arsenal Business and Technology Partnership
Governmental » Military

ABTPAbstractions by the Pool (Copenhagen, Denmark and Vienna, Austria)
Miscellaneous

ABTPAgriculture Business Training Program
Miscellaneous » Farming & Agriculture