| Acronym | Meaning |
| ERR | Error |
| SMPTRB | Shuttle Main Propulsion Test Requirement Board |
| LBR | Low Bit Rate |
| EXH | Exhaust |
| EBCDC | Extended Binary Coded Decimal |
| TC | Time To Circular |
| PSSU | Patch Survey And Switching Unit |
| BP | C&TSSCommunication And Tracking Subsystem |
| DOD-STP | Department Of Defense-Standard Satellite |
| MER | Meridian |