| Acronym | Meaning |
| GCHF | Generator Coordinate Hartree-Fock |
| ACEL | A.c. Electroluminescent |
| PPM | Parts Per Million |
| ESA | Electrokinetic Sonic Amplitude |
| SIC | Std. Industrial Code |
| SMD | Sauter Mean Diameter |
| IMHEX | Internally Manifolded Heat Exchanger (molten Carbonate Fuel Cell Design) |
| DARMA | Deterministic Autoregressive Moving Average |
| ILIAC | International Library Information And Analytical Center |
| IOS | Infinite Order Sudden Approximation |