| Acronym | Meaning |
| SMCL | Secondary Maximum Contaminant Level |
| HEV | Hybrid Electric Vehicle |
| ETS | EPCRA 313 Tracking System |
| CAM | Complex Angular Momentum (for Rotationally Inelastic Scattering) |
| UMTRCA | Uranium Mill Tailings Radiation Control Act |
| DCP-OES | Direct Coupled Plasma-optical Emission Spectroscopy |
| PEYS | Photoelectron Yield Spectroscopy |
| NLGI | National Lubricating Grease Institute |
| PAPP-A | Pregnancy-associated Plasma Protein A |
| PT2F | Second-order Perturbation Theory (with) Fock (matrix) |