| Acronym | Meaning |
| RCC | Reinforced Carbon-Carbon |
| AAVSO | American Association Of Variable Star Observers |
| AIPS | Astronomical Image Processing System |
| TDRS | Tracking And Data Relay Satellite |
| TSS | Targeted Search System / Tethered Satellite System |
| CBR | Cosmic Background Radiation |
| NSA | National Security Agency |
| ATM | Apollo Telescope Mount (on Skylab) |
| HTHL | Horizontal Takeoff Horizontal Landing |
| CIS | Commonwealth Of Independent States |