| Acronym | Meaning |
| OPA | Optical Parametric Amplifier |
| NEA | Nuclear Energy Agency |
| TGN | Trans-Golgi Network |
| NLTE | Non-local Thermodynamic Equilibrium |
| SWMU | Solid Waste Management Unit(s) |
| HFO | Hydrous Ferric Oxide |
| ACO | Atomic-cell Orbital |
| MHC | Myosin Heavy Chain |
| SUMP | Spin-constrained Unrestricted Moeller-Plesset |
| CHEM | Chemical Collection Database (accessible Through OLS) |