| Acronym | Meaning |
 | ANSI | American National Standards Institute |
| ENAC | Energetic Neutral Atom Camera |
| USMC | United States Marine Corps |
| PMT | PhotoMultiplier Tube |
| UPPP | Union Pour La Promotion De La Propulsion Photonique |
| MLI | Multi-Layer Insulation |
| AE | Arianespace SA |
| TOMS | Total Ozone Mapping Spectrometer |
| HPFTP | High Pressure Fuel Turbopump |
| HB | Horizontal Branch |
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