| Abbreviation | Definition |
|---|---|
| HECAP | High Energy Cosmology and Astroparticle Physics |
| HECAP | High Energy, Cosmology and Astroparticle Physics |
| HEDP | High Energy Density Physics |
| HEG | High Energy Gamma |
| HEI | Heat Exchange Institute |
| HEL | Emission of Electromagnetic Wave |
| HEL | Hydrogen Emission Line |
| HELEN | High Energy Laser Embodying Neodymium |
| HELEN | High Energy physics Latin-American-European Network |
| HELP | High Energy Laser Propagation |
| HEP | High Energy Physics |
| HEPA | high efficiency particulate air (filter) |
| HEPA | High Energy Particulate Arresting |
| HEPA | High-Efficiency Particulate Arresting |
| HEPG | High Energy Physics Group |
| HEPL | Hansen Experimental Physics Laboratory |
| HEPL | High Energy Physics Lab |
| HEPPA | High Energy Physics and Particle Astrophysics |
| HERF | Hazard of Electromagnetic Radiation to Fuel |
| HERO | High Energy Replicated Optics |