| Acronym | Meaning |
| NASP | National AeroSpace Plane |
| HAO | High Altitude Observatory |
| NICMOS | Near Infrared Camera/Multi Object Spectrometer |
| IR | InfraRed |
| FAP | Freedom Attached Payloads |
| WIYN | Wisconsin/Indiana/Yale/NOAO Telescope |
| GSFC | Goddard Space Flight Center |
| DFRC | Dryden Flight Research Center |
| NRSC | National Remote Sensing Centre |
| S | Spiral (for Galaxies) |