| Acronym | Meaning |
| TH | Total Hardness [of Water] |
| TIROS | Television And IR Observation Satellite |
| HEL | Human Erythroleukemia |
| OPA | Optical Parametric Amplifier |
| FOCAPD | Foundations Of Computer-aided Process Design |
| GMO | Group Molecular Orbital |
| LCCD | Linear Coupled-cluster (method With) Double (excitations) |
| PCE | Polychromatic Erythrocytes |
| PBDF | Polybrominated Dibenzofuran(s) |
| R2PI | Resonant Two-photon Ionization |