| Acronym | Meaning |
 | MRSR | Mars Rover And Sample Return |
| USMP | United States Microgravity Payload |
| HH | Hitchhiker |
| EDOMP | EDO Medical Project |
| YSO | Young Stellar Object |
| PPM | Positions And Proper Motions (catalog) |
| SPS | Solar Power Satellite |
| PARE | Physiological And Anatomical Rodent Experiment |
| TOPEX | Ocean Topography Experiment |
| ICE | International Cometary Explorer |
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