| Acronym | Meaning |
 | STIS | Space Telescope Imaging Spectrometer |
| STARCAL | Star Calibration |
| IAPPP | International Amateur/Professional Photoelectric Photometry |
| SAM | Shuttle Activation Monitor |
| USO | Ultra-Stable Oscillator |
| VLF | Very Low Frequency |
| USMC | United States Marine Corps |
| SAA | South Atlantic Anomaly / Single Access Antenna |
| ALAE | Atmospheric Lyman-Alpha Emissions |
| NICMOS | Near Infrared Camera/Multi Object Spectrometer |
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