| Acronym | Meaning |
| PNR | Polarized Neutron Reflection |
| INDC | International Nuclear Data Committee |
| LET | Light-emitting Transistor |
| MAPK | Mitogen-activated Protein Kinase |
| BS | Breathing Sphere (approxn. In Mol.-scattering Calcns.) |
| RPV | Reactor Pressure Vessel |
| LIF | Laser Induced Fluorescence |
| TRAMP | Terrestrial Radioactivity Monitoring Programme |
| TSM | Total Suspended Material |
| EH | Extended Hueckel |