| Acronym | Meaning |
| OCIS | Optics Classification And Indexing Scheme |
| AGGG | Advisory Group On Greenhouse Gases |
| ATSDR | Agency For Toxic Substances And Disease Registry |
| EMIRA | Epidemiological And Microbial Risk Assessment |
| SCC | Standards Council Of Canada |
| DCPA | Dynamic Coherent Potential Approxn. |
| EEGL | Emergency Exposure Guidance Levels |
| CCRM | Coupled-channel Reactance Matrix (in Atom Surface Scattering) |
| IEA | International Energy Agency |
| BSCO | Break Specific Carbon Monoxide |