| Acronym | Meaning |
| HIT | Heterojunction With Intrinsic Thin Layer (photovoltaic Cell; Solar Cell) |
| UHIPI | Ultrahigh Intensity Post-ionization |
| EFH | Extended Fenske-Hall (LCAO MO Method) |
| EMAIL | Electronic Mail |
| FDBVM | Finite Difference Boundary Value Method |
| BATHEN | Burnable Fuel Abatement Through Efficient Improvement And Nonfossil Fraction Increase |
| SQL | Standard Quantum Limit |
| APOMA | American Precision Optics Manufacturers Association |
| CHAPEL | Continuous Hydrogen Analysis By Pressure Evaluation In Liquids |
| ECPMET | Extended Coupled Pair Many Electron Theory |