| Engineering Training Services | Academic & Science |
| Educational Testing Services | Academic & Science |
| Electronic Translator System | Academic & Science |
| Estonian Society of Toxicology | Academic & Science |
| Eesti Toksikoloogia Selts | Academic & Science |
| Electron Transport System | Academic & Science |
| Electric Train Systems | Academic & Science |
| Electronic Throttle System | Academic & Science |
| Electric Train Service | Academic & Science |
| Electronic Transaction Systems | Academic & Science |
| Enterprise (al) | Airport Code |
| European Trusted Services | Business |
| Educational Testing Service | Business |
| Employment and Training Services | Business |
| Electronic Thermo-Sensing | Business |
| Enormous Train Store | Business |
| External Transcribed Spacer | Business |
| Extra Traction Sensor | Business |
| Enhanced Tracking System | Business |
| European Tanning Systems | Business |
| Easy To Sell | Business |
| Educational Travel Services | Business |
| Emergency turbo system | Business |
| Except Trial Size | Business |
| Ethyl Sulfate | Chemistry |
| English Tertiary Studies | Community |
| Essential Truth Study | Community |
| Evil Testing Serpent | Community |
| Evangelical Theological Society | Community |
| Ecole Technologie Superieure | Community |
| Evil Testing Satans | Community |
| Equipping The Saints | Community |
| Extreme Training Support | Community |
| Educational Talent Search | Community |
| European Training Strategy | Community |
| Educational Technology Services | Community |
| Everyone Travels Safely | Community |
| European Telecommunications Standard (ETSI) | Computer and Networking |
| European Telecommunication Standard | Computing |
| Electronic Translation System | Computing |
| European Telecommunications Standardization | Computing |
| Enabler Test Specifications | Computing |
| Electronic Tandem Switching | Computing |
| Enhanced Transmission Selection | Computing |
| Education Testing Service | Computing |
| Electronic Trading System | Computing |
| Emergency Telecommunications Service | Computing |
| EMO Telic Subsyntax | Computing |
| Easy To Say | Computing |
| Emerging Technologies Section | Computing |
| Erbs Technology Solutions | Computing |
| East Tsim Sha Tsui, Hong Kong | Country Specific |
| ETHSNIPER | Cryptocurrency |
| Excited Triplet State | Electronics |
| Engine Temperature Sensor | General |
| Electro Tech Systems | General |
| Emergency Temporary Standards | General |
| Electrician's Theme Song | General |
| Emily The Strange | General |
| Evil Testing System | General |
| Evil Testing Service | General |
| End The Slaughter | General |
| E Twenty Six | General |
| Enlisted Termination of Service | General |
| Edited To Say | General |
| Expiration Term of Service | General |
| Examination Tools Suite | General |
| Elite Tactical Systems | General |
| Eat That Sh*t | General |
| Edmonton Transit Service | General |
| Eat That Shit | General |
| Early Takeoff Syndrome | General |
| Enthought Tool Suite | General |
| E26 Transformation Specific | General |
| Easy Template System | General |
| Euro Touring Series | General |
| Enhanced Traction System | General |
| Electronic Traction System | General |
| Electronic Torque Split | General |
| Extreme Turbo Systems | General |
| Expiration of Time and Service | General |
| European Tuning Showdown | General |
| Edmonton Transit System | General |
| Eye Tracking System | General |
| Estimated Travel Speed | General |
| Equivalent Test Speed | General |
| Euro Truck Simulator | General |
| Electronic Traction Support | General |
| Electronic Thermostat Control | General |
| Early Turnover Scheme | General |
| Engine Temperature Switch | General |
| Evaluation Test Specifications | General |
| Emissions Trading Scheme | General |
| Emergency Transport Scheme | General |
| Electronic Truck Steering | General |
| Enhanced Transitional Stability | General |
| Electronic Transitional Stability | General |
| Enabling Transport Solutions | General |
| Expect To Sail | Governmental |
| Emission Trading Scheme | Governmental |
| Estimated Time of Sailing | Governmental |
| Energy Technology Savings | Governmental |
| Energy Thought Summit | Governmental |
| Estimated Termination of Service | Governmental |
| Energy Transformation Systems | Governmental |
| eTravel Services vendor | Governmental |
| Emissions Trading System | Governmental |
| Environmental Tillage Systems | Governmental |
| Eat That S*** | Internet |
| Environmental Tobacco Smoke | Medical |
| Endoscopic Thoracic Sympathectomy | Medical |
| Extraction Tracking Standards | Medical |
| Endoscopic Thoracic Surgery | Medical |
| Europe Trading Services | Messaging |
| Expiration of Term of Service | Military and Defence |
| European Telephone System | Military and Defence |
| Elite Tactical Squad | Military and Defence |
| Estimated Time To Sail | Military and Defence |
| End Term of Service | Military and Defence |
| Enterprise Translation Server | Networking |
| Enterprise, Alabama USA | Regional |
| European Tissue Symposium | Regional |
| European Test Services | Regional |
| European Test Symposium | Regional |
| Equivalent Time Sampling | Softwares |
| Engineering Tool Software | Softwares |
| Erlang Term Storage | Softwares |
| Estimated Time of Separation | Space Science |
| Electrical Test Set | Space Science |
| Energy Transfer System | Space Science |
| External Tank System | Space Science |
| Extended Trading Securities | Stock Exchange |
| Enterprise Technology Services | Technology |
| Education Technology Services | Technology |
| End of Transmission Signal | Telecommunication |