| Acronym | Meaning |
| AHS | Automated Highway System |
| VRMS OR VRMS | Volt Root Mean Square |
| GREM | Geopotential Research Explorer Mission |
| PICS | Positive Ion Composition Spectrometer |
| TDMC | TAMEX Data Management Center |
| ADS | Ancillary Data Service |
| AMS | American Mathematical Society |
| RAS | Retrospective Analysis System |
| RTTOV | Rediative Transfer (RT) Model For Television Infrared Orbiting Satellite (TIROS) Operational Vertical Sounder (TOVS) |
| EM | Engineering Model |