| Acronym | Meaning |
| PNEC | Predicted No-effect Concentration |
| CLC | Coordinated List Of Chemicals |
| PNA | Paraffins, Naphthenes, And Aromatics (in Petroleum Analysis) |
| CILS | Collision-induced Light Scattering |
| SQC | Sediment Quality Criteria |
| AQO | Average Quadrupole Orientation |
| ADA | Adipic Acid |
| JCAHO | Joint Commission On Accreditation Of Healthcare Organizations |
| PIET | Photoinduced Intramolecular Electron Transfer |
| POSAP | Position-sensitive Atom Probe |