Abbreviations beginning with a

ATPAAutomobile Theft Prevention Authority
Governmental » Police

ATPAAdolescent To Parent Abuse
Miscellaneous » Unclassified

ATPAAndean Trade Preference Act
Miscellaneous » Unclassified

ATPACAssociation of Thai Professionals in America and Canada (est. 1991)
Academic & Science

ATPACAir Traffic Procedures Advisory Committee
Governmental » Transportation

ATPaseAdenosine Triphosphatase
Academic & Science

ATPATArmy Test Program Advisory Team (US Army)
Governmental

ATPBAsphalt Treated Permeable Base
Miscellaneous » Unclassified

ATPCAgent Technologies for Pervasive Communities
Academic & Science

ATPCAssociation of Tin Producing Countries
Academic & Science

ATPCAutomatic Transmit Power Control
Academic & Science

ATPCAutomatic Transmit Power Control (radio, wireless)
Academic & Science

ATPCAthey Products Corporation
Business » NASDAQ Symbols

ATPCAutomatic Transmitter Power Control
Computing » IT

ATPCAlta Tensione Produzioni Clandestine
Miscellaneous » Unclassified

ATPCAlternate Text Production Center (Braille, eText)
Miscellaneous

ATPCAppraisal of the Technologies of Political Control
Miscellaneous

ATPCArmy Times Publishing Company, Inc (Springfield, VA)
Miscellaneous