| Acronym | Meaning |
 | APU | Auxiliary Power Unit |
| SAA | South Atlantic Anomaly / Single Access Antenna |
| TSS | Targeted Search System / Tethered Satellite System |
| ORBI | Stock Ticker Symbol For OSC |
| HOTOL | HOrizontal TakeOff And Landing |
| USML | United States Microgravity Laboratory |
| ISU | International Space University |
| MLS | Microwave Limb Sounder |
| IDA | International Dark-sky Association |
| RF | Radio Frequency |
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