| Abbreviation | Definition |
|---|---|
| HLC | High Limit Control |
| HLCD | Horn Loaded Compression Driver |
| HLCM | High Limit Control Model |
| HLCU | Heterodyne Local Control Unit |
| HLF | Horizontal Laminar Flow |
| HLS | Hue, Luminance, Saturation |
| HM | Harmonic Midline |
| HM | High Modulation |
| HMDS | HexaMethylDiSilazane |
| HMIS | Hazardous Materials Inventory Statement |
| HMM | High Mode Multiples |
| HMMP | Hazardous Materials Management Plan |
| HMOS | High-performance n-channel Metal Oxide Semiconductor |
| HMSM | Heterostructure Metal-Semiconductor-Metal |
| HMT | Hydro-Magnetic Technology |
| HO | High Output |
| HOE | Hull Ordnance Electronic |
| HOLZ | Higher-Order Laue Zone |
| HOM | Higher Order Multipoles |
| HOMER | Hazardous Organic Mass Emission Rate |