| Acronym | Meaning |
| SCM | Shell-correction Method (in Calcns. For Metal Clusters) |
| TBSI | N-tert-butyl-2-benzothiazyl Sulfenimide |
| IRCWD | International Reference Center For Waste Disposal |
| REFET | Ref. Field Effect Transistor |
| SPS | Surface Photovoltage Spectroscopy |
| UMP | Unrestricted Moeller-Plesset |
| ECMWF | European Center For Medium Range Weather Forecast |
| CMP | Cytidine 5'-monophosphate |
| IEA | International Energy Agency |
| NPOX | Nonpurgeable Organic Halide |