| Acronym | Meaning |
 | CIU | Communication Interface Unit |
| MSE | Mechanical Support Equipment |
| GCS | Ground Communications System |
| IOB | InPut/Output Buffer (if Bus |
| ORD | Orbital Requirements Document |
| LRU | Line-replaceable Unit |
| NLG | Nose Landing Gear |
| D/A | Digital To Analog |
| MO | Molybdenum |
| PIP | Plant Instrumentation Program |
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