| Acronym | Meaning |
 | RPIE | Real Property Installed Equipment |
| VTVM | VacuumTubeVoltmeter |
| OB | Onboard |
| I | ECM Induced Environment Contamination Monitor |
| T | Thermostabilized |
| PAF | Payload Attach Fitting |
| FPV | Flow Proportioning Valve |
| SPL | System Programming Language |
| NAS | National Academy Of Sciences |
| LAPS | Left Aft Propulsion System (Subsystem) |
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