| Acronym | Meaning |
| HNLC | High-nutrient Low-chlorophyll |
| BTZ | Below The Treatment Zone |
| ECAE | Equal Channel Angular Extrusion |
| NPP | Net Primary Productivity |
| BA + P | Best Atom + Polarization Function |
| BCR | B Cell Receptors |
| BCRU | British Committee On Radiation Units And Measurements |
| MSA | Many-trajectory Semiclassical Approxn. (in At.-collision Theory) |
| PSC | Polar Stratospheric Clouds (in Antarctic) |
| SC-MEH-MO | Self-consistent-modified Extended Hueckel-MO |