| Acronym | Meaning |
| NHE | Na+-H+ Exchanger |
| IDI | Ion Dipole Induced (potential Term In Potential Energy Surfaces) See Also LEPS-IDI |
| GISS | Goddard Institute For Space Studies |
| PAM | Peptidylglycine Alpha-amidating Monooxygenase |
| ECNI | Electron Capture Negative Ionization |
| ART | Advanced Recycling Technologies |
| CCPS | Center For Chemical Process Safety |
| ACHRE | Advisory Committee On Human Radiation Experiments |
| IFSD | In-Flight Shutdown |
| MEMTB | Many-electron Mol. Tight-binding (for Electronic Structures) |