| Acronym | Meaning |
 | USML | United States Microgravity Laboratory |
| JEM | Japanese Experiment Module |
| ACRIM | ACR Irradiance Monitor |
| BFCS | Backup Flight Control System |
| SPTN | SPARTAN |
| NOCC | Network Operations Control Center |
| MRIR | Medium Resolution Infrared Radiometer |
| ATO | Abort To Orbit |
| IGM | InterGalactic Medium |
| E | Elliptical (for Galaxies) |
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