| Acronym | Meaning |
 | PLACE | Position Location Aircraft Communications |
| EQE | Event Queue Element |
| NHA | NNHA Next Higher Assembly |
| VFE | Vendor Furnished EquiPment |
| DCC | Data Computation Complex (JSC) |
| CDP | CommandDataProcessor |
| IPS | Instrument Pointing System (Subsystem) |
| SIS | Serial Input Special |
| CU | Control Unit |
| M | Missing (Data) |
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