Australian Technical College
Australian Telecommunications Commission
Australian Trade Commission
Authority to Construct
Authorization to Copy
Authorized Testing Center
Authorized Training Center
Auto del Tribunal Constitucional
Auto Train Corporation
Auto Tune Combiner
autologous tumor cells
Automated Test Case
Automated Toll Collection
Automatic Target Cueing
Automatic Target Cuing
Automatic Temperature Compensation
Automatic Temperature Controlled
Automatic Through Center
Automatic Time and Charges
Automatic Toggle Clamp
Automatic Tool Change
Automatic Turbine Control
Automation Training Center
Autry Technology Center
Available Transfer Capability
Aviation Training Center
IATA code for Arthurs Town Airport, Arthurs Town, Cat Island, Bahamas
Mini-Armored Troop Carrier
Aberdeen Test Center's
Activités et Techniques de Communication
Administrator Training Center
Advanced Training Centre
Aircraft Technical Committee
Airport Traffic Control
Albuquerque Treatment Center
Alcohol Test Committee
Allowable Threshold Concentration
Alphaville Tênis Clube
amended Type Certification
Analog Technology Corp