| Acronym | Meaning |
| LMTD | Logarithmic Mean Temperature Difference |
| MOPA | Master Oscillator Power Amplifier |
| PAX | Photoemission Of Adsorbed Xenon |
| FZP | Fresnel Zone Plate |
| FEMP | Free Of Empirical Parameters (e.g. |
| LAS | Linear Alkylbenzene Sulfonates (anionic Surfactants) |
| PNP | Purine Nucleoside Phosphorylase |
| PAK | P21-Activated Kinase |
| LET | Linear Energy Transfer (in Spacecraft Power Systems) |
| ECP | Effective Core Potential Approxn.(in Electronic-structure Calcn.) |