| Acronym | Meaning |
| GSMO | Ground-state Molecular Orbital |
| MSS | Multispectral Scanner |
| PVB-CSF | Projected Valence Bond-configuration State Function |
| TRAMP | Terrestrial Radioactivity Monitoring Programme |
| PCR | Principal Component Regression |
| RTNS | Rotating Target Neutron Source |
| PI | Pollution Index |
| TSQMS | Triple-stage Quadrupole Mass Spectrometry |
| FVVM | Finite Volume Variational Method (for Mol. Calcns.) |
| HEIS | High Energy Ion Scattering |