| Acronym | Meaning |
| ALAE | Atmospheric Lyman-Alpha Emissions |
| PCT | Photometric Calibration Test |
| SSRT | Single Stage Rocket Technology |
| WUPPE | Wisconsin Ultraviolet PhotoPolarimter Experiment |
| SMEX | Small EXplorers |
| CRIM | Commercial Refrigerator Incubator Module |
| S | Spiral (for Galaxies) |
| TRMM | Tropical Rainfall Measuring Mission |
| SSRMS | Space Station Remote Manipulator System |
| GSO | GeoSynchronous Earth Orbit |