| Acronym | Meaning |
| NDTT | Nil Ductility Transition Temperature |
| OR | Odds Ratio |
| OOA | Oxygenated Organic Aerosol |
| LET | Light-emitting Transistor |
| WPCR | Water Pollution Control Research (US EPA) |
| UPW | Ultrapure Water |
| QCCA | Quasiclassical Close-coupling Approximation |
| BEIA | Biomedical And Environmental Information Analysis |
| CASSCF-CCI | Complete Active Space Self-consistent Field-contracted CI |
| PMT | Photomultiplier Tube |