| Acronym | Meaning |
| QRF | Quadratic Response Function (a Quantum Propagator) |
| RC(XI) | (fully) Correlated Relativistic Local-density |
| QMO | Quaternionic Molecular Orbital Method |
| CCPP | Combined Cycle Power Plant |
| HBT | Hanbury Brown Twiss (interferometry) |
| SSQW | Strained Single Quantum Well |
| SAE | Society Of Automotive Engineers |
| SAIM | Scaled Atoms-in-molecules |
| HPC | Heterotrophic Plate Count |
| IMSS | International Mass Spectrometry Society |