| Acronym | Meaning |
| HFD-C | Hartree-Fock-dispersion With Repulsive SCF Component (intermol. Potential) |
| HAZW | Hazardous Waste Collection Database (accessible Through OLS) |
| ROBK2 | Relativistic Second-order Oppenheimer-Brinkman-Kramers (in Ion-scattering Calcns.) |
| PAIS | Public Affairs Information Service |
| PNRA | Photon-tagged Nuclear Reaction Analysis |
| HVDB | Halogenated Volatile Disinfection By-products |
| MCLED | Microcavity Light-emitting Diode |
| WSOEA | Wallace Second-order Eikonal Approximation |
| ATG | Antithymocyte Globulin |
| UFL | Upper Flammable Limit |