| Acronym | Meaning |
| NSSN | National Standards Systems Network |
| ZOAO | Zero Overlap Of Atomic Orbital Approxn. |
| IEET | Intramolecular Electronic Energy Transfer |
| CNS | Central Nervous System |
| NLLSF | Non-linear Least Square Fitting |
| BEA | Bureau Of Economic Analysis |
| MPT | Matrix Perturbation Theory |
| OWEC | Office Of Wastewater Enforcement And Compliance |
| EMMA | End-member Mixing Analysis |
| DED | Death Effector Domain |