| Acronym | Meaning |
 | SCFH | Standard Cubic Feet Per Hour |
| INTERFACE | CInterface Control Unit |
| FDM | Frequency Data Multiplexer |
| HL | Heel Line |
| EVLSS | Extravehicular Life Support System |
| SMVP | Shuttle Master Verification Plan |
| RSF | Receiving-Safing Facility |
| U | Underfloor |
| I | D&CA Inverter Distribution And Control Assembly |
| SH2 | Supercritical Hydrogen |
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