| Acronym | Meaning |
| STMAS | Satellite Transition Magic-angle-spinning |
| PLFA | Phospholipid Fatty Acid |
| MCLR | Multiconfigurational Linear Response (an MC-SCF Method) |
| MP2 | Moeller-Plesset Second-order Perturbation Theory |
| PIB | Potential Induced Breathing (model In Electronic-structure Studies In Superconductors) |
| SCF2 | Two-electron Self-consistent Field |
| NTI | Negative Thermal Ionization (for Mass Spectrometry) |
| UKMO | United Kingdom Meteorological Office |
| TRS | Transverse Rupture Strength |
| SIM | Standards Injection Module |