Transaction Tracking System 
Transmission Temperature Switch 
temporary threshold shift 
Text to Speech 
Thule Tracking Station 
Trunk Time Switch 
T Tauri star 
Text-To-Speech 
TILLOTSON 
Transmission Test Set 
Trouble Tracking System 
Tactical Training Squadron 
Tank Thermal Sight 
tarsal tunnel syndrome 
Task Transfer Sheet 
Tele-Type-Setting 
Test and Training Satellite 
Text-To-Speech Synthesis 
Time To Station 
time-temperature-sensitization 
TRI Tracking System 
Trinidad and Tobago Ship 
Trouble Ticketing System 
IATA code for Nasa Shuttle Landing Fac… 
Tactical Training Strategy 
TAILORED-TO-SUIT 
Tank Thermal Sights 
Target Tug Squadron 
TDMA Terminal Simulation 
Tearing Topography Surface