| Acronym | Meaning |
 | PMS | Pre-Main Sequence |
| ATDRS | Advanced Tracking And Data Relay Satellite |
| E | Elliptical (for Galaxies) |
| SPTN | SPARTAN |
| RG | Red Giant |
| ACRV | Astronaut Crew Rescue Vehicle |
| QSO | Quasi-Stellar Object |
| EODC | Earth Observation Data Centre |
| CRAF | Comet Rendezvous/Asteroid Flyby |
| SNG | Sodruzhestva Nezabisimikh Gosudarst |
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