| Acronym | Meaning |
| LNO | Localized Natural Spin Orbital |
| CAST | Cyclic Activated Sludge Technol. |
| NCS | Notification Of Compliance Status |
| IMAGE | International Monitor For Auroral Geomagnetic Effects |
| EML | Environmental Mutational Load |
| NSERC | Natural Sciences And Engineering Research Council (Canada) |
| ZID | Zone Of Initial Dilution |
| EAL-MCDF | Extended Average Level-(relativistic) Multiconfiguration Dirac-Fock |
| SOP/EA | Split-operator Propagator (for) Electronically Adiabatic (phenomena) |
| ALI | Annual Limit On Intake |