| Acronym | Meaning |
 | EM | Emergency |
| ORD | Operational Requirements Document |
| PMF | Performance Monitor (Monitoring) Function |
| MFV | Main Fuel Valve |
| PM | Payload Midbody |
| OPE | Other Project Element |
| NET | NNET Network (N/W Preferred) |
| CDPIS | Command Data Processing And Instrumentation System |
| DDA | Digital Differential Analyzer |
| VTVM | VacuumTubeVoltmeter |
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