sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Electronic Reporting and Tracking System | ** |
| Emergency Return to Service | ** |
| Earth Resources Technology Services | ** |
| Experimental Run Time System | ** |
| East Rowville Terminal Station | ** |
| Electronic Reciprocity Transfer System | ** |
| Emergency Roadside Telephone System | ** |
| Eastern Range Technical Services | ** |
| evangelische radio televisie stichting | ** |
| Experienced Rider Training Symposium | ** |
| Electrified Rapid Transit Systems | * |
| Environmental Report Tracking System | * |
| Erlang Run Time System | * |
| Earth Research Technical Satellite | * |
| Emergency Response Tracking System | * |
| Earth Resources Technological Satellite | * |
| Educational and Research Technology Services | * |
| Electrical Reciprocal Transfer System | * |
| Elk Range Thrust System | * |
| Etudes et de Recherches en Teledetection Spatiale | * |
| Earth Resources Test Satellite | * |
| Electronic Resource Tracking System | * |
| Everett Recycling and Transfer Station | * |
| Environmental Radiological Technical Specification | * |