| Acronym | Meaning |
| ESIX | Electrically Switched Ion Exchange |
| SAMPEX | Solar Anomalous And Magnetospheric Particle Explorer (spacecraft) |
| EOR | Enhanced Oil Recovery |
| IRK | Insulin Receptor Kinase |
| BFGF | Basic Fibroblast Growth Factor |
| HTP | Helical Twisting Power |
| PT2F | Second-order Perturbation Theory (with) Fock (matrix) |
| IRAV | Intense Infrared Active Vibration |
| SCS | Semiclassical Coupled-states |
| TDLAS | Tunable Diode Laser Absorption Spectroscopy |