| Acronym | Meaning |
| UNEP | United Nations Environment Programme |
| OASM | Operational Analysis Support Model |
| IRR | Integrated Requirements Review |
| ISPRA | N/A |
| MPIF | Message Passing Interface Forum |
| MMD | Mass Median Diameter |
| PIREPS | Pilot Reports |
| SAC-C | Argentina's Scientific Applications Satellite |
| ESU | Electrostatic Unit |
| ARTCC | Air Route Traffic Control Center |