| Acronym | Meaning |
| SEP | Societe Europeenne De Propulsion |
| GNC | Guidance |
| HR | Hertzsprung-Russell |
| E | Elliptical (for Galaxies) |
| IDL | Interactive Data Language |
| ZCG | Zeolite Crystal Growth |
| ERS | Earth Resources Satellite |
| MSOCC | Multisatellite Operations Control Center |
| ETM | Enhanced Thematic Mapper |
| TOPS | Toward Other Planetary Systems |