| Acronym | Meaning |
| OEO | Overlap-enhanced Orbital |
| MRS | Monitored Retrievable Storage (for Radioactive Wastes) |
| PRENFLO | PRessurized ENtrained FLOw (process) [combustion And Gasification] |
| RCCSD | (spin) Restricted CCSD |
| AMSU | Advanced Microwave Sounding Unit |
| PE | Performance Evaluation |
| EUSO | Extreme Universe Space Observatory |
| NETAC | National Effluent Toxicity Assessment Center |
| OEBR | Optical Edge Bead Removal |
| CHCS | Chemical Hazards Communication Society |