| Acronym | Meaning |
| BDCT | Best Demonstrated Control Technology |
| CM | Configuration Mixing |
| WCOT | Wall Coated Open Tubular Columns |
| DCO | Delayed Compliance Order |
| MCH | Mean Cell Hemoglobin |
| FEP | Hexafluoropropylene-tetrafluoroethylene Copolymer |
| STLC | Soluble Threshold Limit Concentration |
| PIMA | Polyisocyanurate Insulation Manufacturers Association |
| KHN | Knoop Hardness |
| MR-CEPM | Multireference-coupled Electron Pair Method |