| Acronym | Meaning |
| GIXAS | Grazing Incidence X-ray Absorption Spectroscopy |
| WLAN | Wireless Local Area Network |
| EOM-CC | Equation Of Motion-coupled Cluster |
| SWTR | Surface Water Treatment Rule |
| APC | Antigen Presenting Cell |
| NPY | Neuropeptide Y |
| FP-LMTO | Full-potential Linear Combination Of Muffin-tin Orbitals |
| ICBN | International Code Of Botanical Nomenclature |
| OARM | Office Of Administration And Resources Management (USEPA) |
| ECS | Energy-corrected Sudden (scaling Theory In Mol. Collisions) |