| Acronym | Meaning |
| CAM | Content Addressable Memory |
| IUS | Inertial UPper Stage (was Interim UPper Stage) |
| OMDR | Operations And Maintenance Data Record |
| GPSS | General Purpose System Simulator |
| ND | Neodymium |
| BCT | Bus Configuration Table |
| ODES | Optical Discrimination Evaluation Study |
| PLDM | PayloadManagement |
| ESCA | Electron Spectroscopy For Chemical Analysis |
| TCS | Test Control System |