| Acronym | Meaning |
| APCI | Atm. Pressure Chem. Ionization |
| SPA | Self-consistent Phonon Approximation |
| ISPAC | International Society For Polycyclic Aromatic Compounds |
| LQG | Linear Quadratic Gaussian |
| EIC | Electrostatic Interaction Chromatography |
| ES | Energy Sudden (approxn. In Scattering Calcns.) |
| OPEC | Organization Of Petroleum Exporting Countries |
| HAPPS | Hazardous Air Pollutant Prioritization System |
| RDI | Reference Daily Intake |
| DAF | Decay-accelerating Factor |