Electronic Translator System 
Educational Testing Service 
Emergency Telecommunications Service 
Emergency Telecommunication Service 
Engineering Test Satellite 
Environmental Tobacco Smoke 
European Telecommunication Standard 
European Telephone System 
Expiration of Term of Service 
Educational Testing Services 
Electronic Tandem Switching 
Enhanced Traction System 
European Telecommunications Standard 
Expiration Term of Service 
Electrical Test Set 
electron transport system 
Electronic Translation System 
Electronics Technicians 
Energy Transfer System 
Estimated Time of Sailing 
Ethernet Terminal Server 
European Troop Strength 
Eastern Telephone Systems 
Econometric Time Series 
Effective Transmission Speed 
Electron Transmission Spectroscopy 
Electronic Technology Systems 
Electronic Telegraph System 
Electrotransport Therapeutic System 
Emergency Temporary Standard