| Acronym | Meaning |
| HPSN | Hot-pressed Silicon Nitride |
| PEPICO | Photoelectron-photoion Coincidence Spectroscopy |
| LSDC | Local Spin Density Correlation (functional) |
| BPL | Bone Phosphate Of Lime (phosphate Content As Calcium Phosphate) |
| ABWAG | Abwasserabgabengestres (Germany Wastewater Discharge Law Regulates Cost Per Volume) |
| ERIC | Educational Resources Information Center |
| ORO | Office Of Regional Operations |
| AFBR | Anaerobic Fluidized-bed Reactor |
| POSAP | Position-sensitive Atom Probe |
| NAEG | Nevada Applied Ecology Group (of US Department Of Energy) |