| Acronym | Meaning |
| HEOS | Highly Eccentric Orbit Satellite |
| ISBN | International Standard Book Number |
| TSM | Theoretical Studies And Modeling |
| ATSR | Argonne Thermal Source Reactor |
| FORTELL | Not An Acronym |
| EAG | Environmental Assessments Group |
| AWQC | Ambient Water Quality Criteria |
| F | Fahrenheit |
| LLP | Lightning Location And Protection |
| ALARA | As Low As Reasonably Achievable |