| Acronym | Meaning |
| HEAO | High Energy Astronomical Observatory |
| ISO | International Standards Organization |
| HB | Horizontal Branch |
| IPAC | Infrared Processing & Analysis Center |
| INTELSAT | International Telecommunications Satellite |
| SMS | Shuttle Mission Simulator |
| LRSI | Low-temperature Reusable Surface Insulation |
| INCO | Integrated Communications Officer |
| JCMT | James Clerk Maxwell Telescope |
| UIT | Ultraviolet Imaging Telescope |