| Acronym | Meaning |
| ISY | International Space Year |
| ZHR | Zenith Hourly Rate |
| GDCLS | General Dynamics Commercial Launch Services |
| GPS | Global Positioning System |
| SIR | Shuttle Imaging Radar |
| CRIM | Commercial Refrigerator Incubator Module |
| DC | Delta Clipper |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| ISEP | Isolated/Stabilized Exercise Platform |
| CXBR | Cosmic X-ray Background Radiation |