| Acronym | Meaning |
| HAPEM | Hazardous Air Pollutant Exposure Model |
| NNLS | Non-negative Least-squares |
| CAMD | Computer Aided Material Design |
| SLEEP | Scanning Low Energy Electron Probe |
| CGCT | Constrained Geometry Catalyst Technology [polymerization] |
| HMW | High Molecular Weight |
| MEP | Molecular Electrostatic Potential |
| B2B | Boundary(-corrected) Second Born (for Scattering) |
| NAERG | North American Emergency Response Guidebook |
| COPW | Complete Orthogonalized Plane Wave |