| Acronym | Meaning |
| UVPI | Ultraviolet Plume Instrument |
| MSU | Microwave Sounding Unit |
| HTVL | Horizontal Takeoff Vertical Landing |
| ESPC | European Space Power Conference |
| SSRT | Single Stage Rocket Technology |
| VLT | Very Large Telescope |
| APT | Automatic Photoelectric Telescope |
| DPM | Drop Physics Module |
| JILA | Joint Institute For Laboratory Astrophysics |
| PMC | Permanently Manned Capability |