| Acronym | Meaning |
| SLMTO | Surface Linear (combination) Of Muffin-tin Orbitals |
| TLS | Two-level System (with Tunneling Transitions Between Wells Of Double-well Potential) |
| HWRIC | Hazardous Waste Research And Information Center |
| MRM | Multiresidue Method |
| MP4(DQ) | Moeller-Plesset Perturbation Treatment To Fourth Order In The Space Of Double And Quadruple Substitutions |
| USRA | Universities Space Research Association |
| RATM | Renormalized Average T-matrix (for D.-of-states Calcns.) |
| BIXE | Bombardment-induced X-ray Emission |
| IPVD | Ionized Physical Vapor Deposition |
| PBZN | Peroxybenzoyl Nitrate |