| Acronym | Meaning |
| PGP | Previous Glacial Period (glacial Maximum Of O18 Stage 6; Predates The LGM) |
| RIP | RCRA Implementation Plan |
| FLC | Ferroelec. Liq. Crystal |
| FBBR | Fluidized Bed Biofilm Reactor |
| ADES | Angle-dispersed Electron Spectroscopy |
| EQA | External Quality Assessment |
| APM | Acoustic Plate Mode |
| DCBOX | Distorted Coulomb-Born No-exchange Approxn. |
| ZPL | Zero-phonon Line |
| LET | Linear Energy Transfer (in Spacecraft Power Systems) |