| Acronym | Meaning |
 | OPF | Orbiter Processing Facility |
| NTR | Nuclear Thermal Rocket(ry) |
| STSCI | Space Telescope Science Institute |
| SWLC | Salt Water Leak Check |
| NBS | National Bureau Of Standards |
| GOES | Geostationary Orbiting Environmental Satellite |
| GDS | Great Dark Spot |
| GPPF | Gravitational Plant Physiology Facility |
| SMC | Small Magellanic Cloud |
| PPM | Positions And Proper Motions (catalog) |
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