| Abbreviation | Definition |
|---|---|
| HLA | High-Level Architecture |
| HLB | High-Level Bus |
| HLCM | High Level Component Model |
| HLE | Hardware Lock Elision |
| HLK | Hardware Lab Kit |
| HLS | Hardware Logic Synthesis |
| HLTD | High-Level Technical Design |
| HMD | Head-Mounted Display |
| HMDE | Hanging Mercury Drop Electrode |
| HMS | Hardware Meets Software |
| HMS | Hardware Memory Scrubber |
| HMSD | Helmet-Mounted Sight Display |
| HMSE | HMS (Hotel Management Software) Magnetic Stripe Encoder |
| HMT | Head Mounted Tablet |
| HN | High Nit (luminosity) |
| HNA | Hitachi Network Architecture |
| HNAT | Host Network Address Translation |
| HNED | Home Network Entertainment Device |
| HO2S | Heated Oxygen Sensor |
| HOC | Heatpipe On CPU |