| Acronym | Meaning |
| FIMDA | Fluorescence Intensity Multiple Distributions Analysis |
| BOCV | Biorthogonality Constrained Variation Method |
| OPPE | Office Of Policy |
| PSEP | Polyhedral Skeletal Electron Pair (for Metal Clusters) |
| ECISDTQ | Size-extensive CISDTQ |
| EIE | Equilibrium Isotope Effect |
| SOBO | Spin-orbit (coupled) Bond Orbital |
| FSR | Fractional Synthesis Rate |
| 2DEG | Two-dimensional Electron Gas |
| OLO | On-line Optimization |