| Abbreviation | Definition |
|---|---|
| ETI | Environmental Testing Inc |
| ETI | Equestrian Trails Inc |
| ETI | Eyemail Technology Inc |
| ETI | Tech Inc |
| ETISA | Especialidades Tecnicas Industriales, SA |
| ETL | Edison Testing Laboratories |
| ETLL | Epyllion Testing Lab Ltd |
| ETPI | Eastern Telecom Phil Inc |
| ETPI | Eastern Telecommunications Philippines Inc |
| ETPL | Exploit Technologies Pte Ltd |
| ETR | Electric Tool Repair |
| ETRI | Electronics and Telecommunications Research Institute (South Korea) |
| ETS | Educational Testing Service |
| ETS | Educational Travel Services |
| ETS | Enormous Train Store |
| ETS | European Tanning Systems |
| ETS | European Trusted Services |
| ETSI | Educational Travel Services, Inc. |
| ETSI | Energy Transfer Solutions, Inc. |
| ETSI | Enterprise Technology Solutions, Inc. |