| Acronym | Meaning |
| MR-MP | Multireference Moeller-Plesset (perturbation Theory) |
| HKS | Hartree-Kohn-Sham (quantum Theory) |
| MBBR | Moving Bed Biofilm Reactor |
| LEAR | Low Energy Antiproton Ring |
| THCP | Total Hazard Control Plan |
| NOLMOS | Nonorthogonal (strictly) Local Molecular Orbitals |
| FCP | Function Counterpoise (method For Eliminating Basis Set Superposition Error) |
| DRI | Differential Refractive Index |
| BEA | Bureau Of Economic Analysis |
| MAE | Microalloying Elements |