| Acronym | Meaning |
| SETB | Semiempirical Tight Binding |
| ARPUS | Angle-resolved Ultraviolet Photoelectron Spectroscopy |
| RILS | Regulatory Interpretation Letters |
| AARC | Alliance For Acid Rain Control |
| EAGLE | European Association For Grey Literature Exploitation |
| MCA | Manufacturing Chemist Association |
| MRDL | Maximum Residual Disinfectant Level |
| CFM | Charge-fluctuation Model |
| BARC | Bottom Antireflective Coating |
| PINN | Proposed International Nonproprietary Names (for Drugs) |