| Acronym | Meaning |
| EPM | Electron Probe Microscopy |
| EPAAR | EPA Acquisition Regulation Manual |
| GCP | Good Clinical Practice |
| ABO | Adiabatic Born-Oppenheimer (wave Functions) |
| RE | Relativistic Eikonal |
| MRM | Multiresidue Method |
| DSW | Dirac Scattered-wave (often As SCF-X(alpha)-DSW Method) |
| AIGER | American Industry Government Emissions Research Consortium |
| CIPW | Cross, Iddings, Pirrson, And Washington (for Geology Terminology) |
| INDO/S | INDO/spectroscopic Approxn. |