| Acronym | Meaning |
 | TSTO | Two Stage To Orbit |
| APU | Auxiliary Power Unit |
| NOAA | National Oceanic And Atmospheric Administration |
| IUS | Inertial Upper Stage |
| WSMR | White Sands Missile Range |
| VLF | Very Low Frequency |
| POEM | Polar Orbiting Earth Mission |
| RKA | Rossiskoye Kosmicheskoye Agentsvo |
| ER | Eastern Range |
| ISO | Imaging Spectrometic Observatory |
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