Abbreviations beginning with a

ATAGUAAsociación de Técnicos Azucareros de GUAtemala
International » Guatemalan

ATAHAlamedans Together against Hate (Alameda, CA)
Academic & Science

ATAHAuxiliary Total Artificial Heart (cardiovascular medicine)
Academic & Science

ATAHAntenna Train Angle Horizontal (fighter aircraft targeting)
Governmental

ATAHAdvanced Technology Associates Hawaii (Kaneohe, HI)
Miscellaneous

ATAHAssociation Tunisienne des Automobiles Historiques
Miscellaneous » Automotive

ATAHCAustralian Trial for Acute Hepatitis C
Academic & Science

ATAIAcute Thoracic Aortic Injury (radiology)
Academic & Science

ATAIAdvanced Topics in Artificial Intelligence
Academic & Science

ATAIArt Teachers' Association of Ireland (Dublin, Ireland)
Miscellaneous

ATAIUAllied Technical Air Intelligence Unit (military cooperative; US Air Force; Royal Airforce; Royal Australian Air Force)
Governmental

ATAKAndroid Tactical Assault Kit
Governmental » Law & Legal

ATAKAccelerated Touch Advanced Kit
Miscellaneous » Unclassified

ATAKAcoustically Tuned Applied Kinetics
Miscellaneous » Automotive

ATAKAcoustically Tuned Applied Kinetics
Miscellaneous » Unclassified

ATAKAdvanced Tactical Angling Kayak
Miscellaneous » Unclassified

ATAKAmbidextrous Tourniquet Attachment Kydex
Miscellaneous » Unclassified

ATALAgent Theories Architectures and Languages
Academic & Science » Language & Literature