| Acronym | Meaning |
 | TD | Time Delay |
| IOB | InPut/Output Buffer (if Bus |
| CM | Crew Module |
| ISSL | Initial Spares Support List |
| SECS | Shuttle Events Control |
| SBE | Sub-Bit Encoder |
| FPPR | Fixed Price With Price Revision |
| M | LcsManagement Information And Control System |
| IP | Igloo Pallet |
| ISIL | Interim Support Items List |
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