| Abbreviation | Definition |
|---|---|
| HKCU | HKEY_CURRENT_USER (Windows registry) |
| HKLM | H Key Local Machine |
| HKU | HKEY_USERS (Windows registry) |
| HL | Hashed List |
| HLD | High Level Design |
| HLGL | High Limit General Liability |
| HLL | High Level Language |
| HLS | Hue-Lightness-Saturation |
| HMA | High Memory Area |
| HMD | Holographic Monitor Device |
| HMI | Host Micro Interface |
| HMMP | HyperMedia Management Protocol |
| HMMS | HyperMedia Management Schema |
| HOE | Holographic Optical Elements |
| HOGA | Hybrid Optimization by Genetic Algorithms |
| HOPE | Hotline Open Protocol Extension |
| HOST | Hardware And Operating System Troubleshooting |
| HOST | Hawaii Operational Safety Team |
| HPC | Handheld Personal Computer |
| HPCC | High Performance Computing and Communications |