| Acronym | Meaning |
| EESOP | Electronegativity Equalization With S-orbital Participation |
| XPEEM | X-ray Photoemission Electron Microscopy |
| ESD | Emission Standards Division |
| EMBL | European Molecular Biology Laboratory |
| SODART | Soviet Danish Roentgen Telescope |
| X-SAR | X-Band Synthetic Aperture Radar |
| CCSDTQ | CCSDT (with) Quadruple (excitations) |
| DBP | Disinfection By Product |
| DCID | Dimensionless Circular Intensity Difference |
| BEWS | Biological Early Warning Systems |