| Abbreviation | Definition |
|---|---|
| HRC | Half-Rate CODEC (CODer-DECoder) |
| HRC | Harmonically Related Carrier |
| HRC | High Rupture Capacity |
| HRC | Hypothetical Reference Circuit |
| HREC | Hood River Electric Cooperative |
| HREELS | High-Resolution Electron Energy Loss Spectroscopy |
| HREM | High-Resolution Electron Microscopy |
| HRFD | High Resolution Fourier Diffractometer |
| HRS | Holographic Readout System |
| HRTEM | High-Resolution Transmission Electron Microscopy |
| HRU | High-current Relay Unit |
| HS | Harmonic Synthesizer |
| HS | High Sensitivity |
| HSBT | High Speed Bus Transfer |
| HSE | High-Speed External Clock |
| HSEL | High Speed Electronics Lab |
| HSESP | Hanford Site Electrical Safety Program |
| HSET | Hangzhou Sanhe Electronic Technology |
| HSI | High-Speed Internal Clock |
| HSM | HP (Hewlett-Packard) Suface Mount |