| Acronym | Meaning |
 | OTH | Over-the-Horizon (.Radar) |
| TPS | Thermal Protection System |
| SPA | Signal Processor Assembly |
| DFRN | PRESSDifferential Pressure |
| MPL | Maintenance Parts List |
| LEM | Laboratory Environment Model |
| RM | Right Mid |
| TP | Transition Period (T.P. Preferred) |
| EVCON | Events Control (Subsystem) |
| RFC | Request For Change Revolution |
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