| Acronym | Meaning |
 | S | Spiral (for Galaxies) |
| SCT | Schmidt-Cassegrain Telescope |
| SNR | Signal To Noise Ratio / SuperNova Remnant |
| DAO | Dominion Astrophysical Observatory |
| XUV | Extreme Ultraviolet |
| RKA | Rossiskoye Kosmicheskoye Agentsvo |
| VVS | Voenno-Vosdushniye Sili |
| ER | Eastern Range |
| USO | Ultra-Stable Oscillator |
| DFRF | Dryden Flight Research Facility |
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