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Abkürzung-Kategorie: h
| Abkürzung | Langform |
| HLR | Home Location Register |
| HLRN | Hochleistungs-Rechenzentrum Niedersachsen |
| HLRS | Höchstleistungsrechenzentrum Stuttgart |
| HLRZ | Hochleistungs-Rechenzentrum (GMD) |
| HLS | Hue, Lightness/Luminance, Saturation (Farbmodell) |
| HLT | Halt |
| HM | Hilfskanal Meldeleitung |
| HM | Hydraulic Modul |
| hm | Heard- und MacDonald-Inseln |
| HM | Heckmodul |
| HMA | High Memory Area |
| HMA | Hub Management Architecture |
| HMAC | Hash Message Authentication Code |
| HMC | Hardware Management Console |
| HMC | Her/His Majestys Computer (Fun) |
| HMD | Head/Helmet Mounted Display |
| HMI | Horizontal Motion Index |
| HMI | Human Machine Interface |
| HMMP | Hypermedia Management Protocol |
| HMMS | Hypermedia Management Scheme |
| HMOS | High Density Metal Oxide Semiconductor |
| HMOS | High Speed Metal Oxide Semiconductor |
| HMP | Heterogeneous Multi-Processing |
| HMP | Host Monitoring Protocol |
| HMT | Hexamethylentetramin |
| HMUX | Hybrid Multiplexer |
| HN | Honduras |
| hnc | CNC-Programmdateien Heidenhain-Dialog / ASCII |
| HNS | Homogeneous Calculated Surfaces |
| HNUA | Heptylnonylundecyladipat |
| HNUP | Heptylnonylundecylphthalat |
| Ho | oberer Heizwert |
| HO2S | Heated Oxygen Sensor |
| HOAI | Honorarordnung für Architekten und Ingenieure |
| HOB | Head Of Bus |
| HOH | HDSL Overhead Bit Handling |
| HOL | High-Order Logic |
| HON | Health On the Net |
| HOP | Homecast Open Protocol |
| HOPTE | High Order Path Terminating Equipment |
| HOS | Health Online Service |
| hot | Internet-Browser Hotlists |
| HP | Hydraulic Pump |
| HP | Home Page |
| hp | HorsePower |
| HP | Hochpass |
| HP | Hewlett-Packard |
| HPC | Head Performance Criterion |
| HPC | High Performance Cluster/Computing |
| HPC | Health Professional Card |