| Acronym | Meaning |
| NPP | Net Primary Productivity |
| QAR | Quality Assurance Reagent |
| SIEC | Spherical Inertial Electrostatic Confinement |
| GGA | Generalized Gradient Approxn. |
| RIOSA | Reactive Infinite-order Sudden Approxn. |
| FMASH | FeO-MgO-Al2O3-SiO2-H2O System |
| PCDW | Pluvinage Continuum Distorted Wave ( A Wave Function In Calcns. On Atomic And Molecular Collisions) |
| AMBER | Assisted Model Building With Energy Refinement |
| QSR | Quality Status Report (of North Sea Task Force) |
| TCR | Total Chlorine Residual |