Air Traffic Control 
Automatic Temperature Control 
Automatic Transmission Control 
address translation control 
Adaptive Transform Coding 
Address Translation Cache 
Address Translation Controller 
Adiabatic Toroidal Compressor 
Ancillary Terrestrial Component 
ATE Computer 
Ablative Thrust Control 
Abstract Test Case 
Analog Transmission Channel 
Asynchronous Transfer of Control 
Atsugi Technical Center 
Automatic Threshold Control 
Automatic Timing Control 
Automatic Traction Control 
Automatic Train Control 
Absolute Time Corrector 
Access Tandem Connection 
Access Tandem to Carrier 
Access To Carrier 
Acoustic Tile Ceiling 
acoustical tile ceiling 
Advanced Telecommunications Corporatio… 
Advanced Telematics Centre 
Advanced Thermo Concept 
Advanced Tightly Coupled 
Advanced Transfer Cache