| Acronym | Meaning |
 | OPP | Opportunity |
| CCU | Communications Carrier Umbilical |
| MIA | Multiflex Interface Adapter |
| ICF | Interface Control Function |
| TOC | Total Organic Carbon |
| ICAO | International Civil Aviation Organization |
| ETSS | External Tank Separation Subsystem |
| HO | Hydrogen-OxYgen |
| RANN | Research Applied To National Needs |
| HV | High Velocity |
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