| Acronym | Meaning |
| CPSSR | Coulomb-repulsion Perturbed Stationary State With Relativistic Effects |
| ORM | Other Regulated Material (DOT) |
| IRCWD | International Reference Center For Waste Disposal |
| FECO | Fringes Of Equal Chromatic Order |
| OEMO | One Electron Molecular Orbital |
| GIRM | Generalized Internal Reference Method |
| RIOSA | Rotational Infinite Order Sudden Approxn. |
| ECF | Elemental Chlorine Free [as In Nonchlorine Bleaching] |
| SCOPW | Self-consistent Orthogonalized Plane Wave |
| SSSA | Soil Science Society Of America |