| Acronym | Meaning |
| PFBC | Pressurized Fluidized-bed Combustion (in Energy Technology) |
| ORNL | Oak Ridge National Laboratory |
| PD | Photoelectron Diffraction |
| IAEG | International Association Of Engineering Geology |
| AHMM | Academy Of Hazardous Materials Management |
| GTDA | Generalized Tamm-Dancoff Approximation |
| MFO | Mixed-function Oxidase |
| MCPSAG | Marcus-Coltrin-Path Semiclassical Adiabatic Ground-state (transmission Coeffs.) |
| RFB | Recycle Fluidized-bed |
| STAIRS | Storage And Information Retrieval System |