| Acronym | Meaning |
| RC(XI) | (fully) Correlated Relativistic Local-density |
| ASSIST | Abstract Semi-Markov Specification Interface To The SURE Tool [propulsion] |
| WASP | Workplace Analysis Scheme For Proficiency |
| COMFA | Comparative Molecular Field Analysis |
| AATSR | Advanced Along-Track Scanning Radiometer |
| ETO | Exponential-type Orbital |
| SGBD | Steam Generator Blowdown |
| AMBR | Anaerobic Migrating Blanket Reactor [for Wastewater Treatment] |
| CCA | Copper Chromium Arsenic |
| RSK | Ribosomal S6 Kinase |