| Acronym | Meaning |
| OCAP | Open-channel Air Preheater |
| OSEE | Optically Stimulated Electron Emission |
| ANITA | Ammonia And Nitrification Analyzer |
| ZPC | Zero Point Of Charge |
| SPAD | Single Photon Avalanche Diode |
| IDWSSD | International Drinking Water Supply And Sanitation Decade (of UN |
| ARS | Autonomously Replicating Sequence |
| ASA | Alternancy Symmetry Adapted (method For Spin-independent Hamiltonians For Alternant Hydrocarbons) |
| CEMC | Canonical Ensemble Monte Carlo |
| SPC | Statistical Process Control |