| Acronym | Meaning |
| OBC | Onboard Computer |
| DNO | Descending Node Orbit |
| COS | Cosine |
| TRS | Time Reference System |
| SCCM | Standard Cubic Centimeters Per Minute |
| CTU | Central Timing Unit |
| SCDR | Subcontractor Critical Design Review |
| SCOS | Subsystem Computer Operating System |
| DM | DeveloPmental Instrumentation MDM.Mid |
| OCDR | Orbiter Critical Design Review |