| Abbreviation | Definition |
|---|---|
| HDR | High Dynamic Range |
| HDR | High Dynamic Ring |
| HDSD | Hydrogen Defect Shallow Donors |
| HDSL | High-bit-rate Digital Subscriber Line |
| HDSX | High Definition Sound Expansion |
| HDT | Horizontal Drive Transistor |
| HDTM | Half-Duplex Transmission Mdule |
| HDTM | Half-Duplex Transmission Module |
| HDTV | High Definition Television |
| HDV | High Definition Video |
| HDZ | Hard disk size |
| HEA | HI-END Audio |
| HEBT | Heterostructure Emitter Bipolar Transistor |
| HEC | Harrisonburg Electric Comission |
| HEC | Harrisonburg Electric Commission |
| HEC | Hasselblad Electric Camera |
| HEC | Hillside Electronics Corporation |
| HEC | Hybrid Electric Car |
| HED | Hall Effect Device |
| HED | Horizontal Electric Dipole |