| Acronym | Meaning |
| HEV | Hepatitis E Virus |
| CTEQ | The Coordinated Theoretical-Experimental Project On QCD |
| NPV | Net Present Value {economics} |
| SSC | Sudden Storm Commencement (magnetic Storm) |
| OCD | Overlapping Charge Density (model In Electronic Structure) |
| WLN | Washington Library Network |
| FKN | Field-Koros-Noyes (mechanism) |
| WQA | Water Quality Association |
| ATD | Atmospheric Technology Division |
| EPSRC | (United Kingdom) Engineering And Phys. Sciences Research Council |