| Acronym | Meaning |
| NTI | Negative Thermal Ionization (for Mass Spectrometry) |
| ATLAS | Airborne Tunable Laser Absorption Spectrometer |
| A.I. | Active Ingredient |
| RAM | Random Access Memory |
| PFA | Principal Factor Analysis |
| CTR | Calcitonin Receptor |
| FARM | Fixed-angle Reactor Model (in Quantum Calcns. On Reactive Scattering) |
| IAHR | International Association For Hydraulic Research |
| ECG | Electrochemical Grinding |
| CHF | Coupled Hartree-Fock |