| Acronym | Meaning |
| BIPM | Bureau International Des Poids Et Mesures |
| PAW | Projector Augmented-wave [ab-initio Method] |
| ABO | Adiabatic Born-Oppenheimer (wave Functions) |
| PCE | Tetrachloroethylene (perchloroethylene Or Perk) |
| CBED | Convergent-beam Electron Diffraction |
| NAPBN | National Air Pollution Background Network |
| SIC | Standard Industrial Classification |
| KRIPES | K-resolved Inverse Photoemission Spectroscopy |
| BZ | 3-quinuclidinyl Benzilate (chemical Warfare Agent) |
| MEP | Matrix Effective Potential (for Scattering Calcns.) |