| Acronym | Meaning |
| PHWR | Pressurized Heavy Water Reactor |
| ICISS | Impact Collision Ion Scattering Spectroscopy |
| CAFEGE | Classically Approximated Free-electron-gas Exchange |
| NOI | Notice Of Intent |
| EGA | Evolved Gas Analysis |
| HRV | Human Rotavirus |
| TO | Topological Orbital (in Graph Theory Of Molecules) |
| LCOAO | Linear Combination Of Orthogonal Atomic Orbitals |
| DMSP | Defense Meteorological Satellite Program |
| APSG | Antisymmetrized Product Of Separated Geminals |