| Acronym | Meaning |
| GAC | Global Area Coverage |
| BPI | Bits Per Inch |
| PRC | People's Republic Of China |
| SCOPE | Scientific Committee On Problems Of The Environment |
| HRS | Hardwae Requirements Specification |
| RFQ | Request For Quote |
| FDDA | Fiber Distributed Data Interface |
| ESDI | Enhanced Samll Device Interface |
| ARD | Air & Radiation Division |
| IVVS | Interactive Verification And Visualization System (RTVS) |