| Acronym | Meaning |
| BPB | Blood Lead |
| IEL | Independent Electron (model In Ion-impact Ionization Calcns.) |
| ERL | Environmental Research Laboratory |
| DASP | Discontinuous Activated Sludge Process |
| NIRIM | National Institute For Research In Inorganic Materials |
| ISCAT | Investigation Of Sulfur Chemistry In The Antarctic Troposphere |
| ILAP | Inter-Laboratory Analysis Program |
| MPR | Maximum Permissible Risk |
| GRI | Gas Research Institute |
| MRSD-CI | Multireference Single And Double Excitation CI |