| Abbreviation | Definition |
|---|---|
| HEDB | High energy density beam |
| HEDM | High Energy Density Matter |
| HEDON | Household Energy Development Organisations Network |
| HEDP | High Energy Density Physics |
| HEDP | High Energy Density Plasma |
| HEDS | High Energy Density Science |
| HEEB | High Energy Electron Beam |
| HEEI | Hotel Energy Efficiency Initiative |
| HEESA | Hydro Environmental Energy Systems Analysis |
| HEET | Home Energy Efficiency Team |
| HEET | Houghton Energy Efficiency Team |
| HEF | Hi Energy Fish |
| HEF | High Energy Focus |
| HEF | High Energy Fuel |
| HEF | Human Energy Field |
| HEF | Human Energy Fields |
| HEFT | High Energy Focusing Telescope |
| HEI | Harmer Energy International |
| HEI | High Energy Igntion |
| HEI | High Energy Induction |