| Acronym | Meaning |
| HRSI | High-temperature Reusable Surface Insulation |
| SSRT | Single Stage Rocket Technology |
| SLF | Shuttle Landing Facility |
| HOTOL | HOrizontal TakeOff And Landing |
| FRED | Space Station Freedom |
| ISM | InterStellar Medium |
| MDSSC | McDonnell Douglas Space Systems Corp |
| POEM | Polar Orbiting Earth Mission |
| ENAC | Energetic Neutral Atom Camera |
| IPS | Inertial Pointing System |