| Acronym | Meaning |
| SSS | Software Segment Specification |
| GA | Billion Years Unit |
| ADAACS | Affiliated Distributed Active Archive Centers |
| ECCN | Export Control Classification Number |
| APS | American Physical Society |
| SPOT | Systeme Pour L'Observation De La Terre (France) |
| (ES) | Sporadic E |
| ARPA | Advanced Research Projects Agency |
| ERL | Environmental Research Laboratory |
| RAND OR RAND | Research And Development |