| Acronym | Meaning |
| QC | Quality Control |
| RSM | Reduction Symmetry Method (in Crystal Field Theory) |
| MQMAS | Multiple-quantum Magic-angle Spinning |
| SQUID | Superconducting Quantum Interference Device |
| ESIS | European Structural Integrity Society |
| IRES | Infrared Emission Spectroscopy |
| ICRMS | International Chemical Regulatory Monitoring System |
| GRAM | Generalized Rank Annihilation Method |
| INID | Internationally Agreed Numbers For The Identification Of Data |
| QCISD(T) | Quadratic CI (with) Single (and) Double (excitations) (and) [triple Excitations Added Perturbatively] |