| Acronym | Meaning |
| PPL | Priced Parts List |
| INT | Intensity |
| CSD | Chemical Systems Division |
| LAT | Large Angle Torque |
| PMC | Payload Monitoring And Control |
| OIS | Orbiter Instrumentation Systems |
| MECF | Main Engine Computational Facilities |
| OPGUID | OPtimum Guidance (Technique) |
| PGDCS | Subsystem |
| HRIR | High Resolution Infrared Radiometer |