| Acronym | Meaning |
| SEC | Securities & Exchange Commission |
| EI | Electron Ionization |
| UARS | Upper Atmosphere Research Satellite |
| VSM | Vertical Slab Model |
| AWRDF | Advanced Weapons Radiochemical Diagnostics Facility |
| I/O | Input/output |
| NEXUS | Navaid-based Upper- Air Sounding System |
| VMS | Virtual Memory Systems |
| ISWS | Illinois State Water Survey |
| VCO | Voltage-controlled Oscillation |