Intelligent Transportation Systems 
Information Technology Services 
Intelligent Transportation System 
Idle Tracking Switch 
Institute for Telecommunication Scienc… 
integrated tool set 
Information Technology Security 
Intelligent Transport Systems 
integrated training system 
Incompatible Timesharing System 
Information and Technology Services 
Instrumentation Telemetry Station 
Integrated Truss Structure 
Intelligent Transport System 
Intense Text Sex 
Interim Teleprinter System 
International Temperature Scale 
Internet Transaction Server 
Idaho Test Station 
Incompatible Time-sharing System 
Individual Training Standards 
Information Technology Systems 
Information Transmittal Sheet 
Initial Training School 
Inner Thermal Shield 
insertion test signal 
Instructor Training Scheme 
Insulation Test Specification 
In-tank solidification 
Integrated Test System