| Acronym | Meaning |
| IRI | International Reference Ionosphere |
| NMJ | Neuromuscular Junction |
| PRA | Plasma Renin Activity |
| CASP | Computer-assisted Synthesis Planning |
| HEN | Heat Exchanger Network |
| OBE | Optical Bloch Equation |
| WALTZ | Wonderful Alternating Phase Technique For Zero Residual Splittings |
| MSP | Macrophage Stimulating Protein |
| CTE | Charge-transfer Efficiency |
| LOSC | Law Of The Sea Convention |