| Acronym |  | Definition | Topics | External Links | |
| H |
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Hexadecimal (sometimes as lowercase h) |
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| H/PC |
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Hand-held Personal Computer |
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| HA |
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High Availability / Highly Available |
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| HAAK |
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(SHS) The Hacker Acronym & Abbreviation Knowledgebase |
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| HAARP |
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High-frequency Active Auroral Research Program |
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| HACMP |
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[AIX] High Availability Cluster Multi-Processing |
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| HAJ |
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HTML And Javascript (microformat) |
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| HAL |
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Hardware Abstraction Layer |
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| HALE |
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Hacker's Against Law Enforcement |
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| HAM |
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Hybrid Access Method |
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| HAND |
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Have A Nice Day |
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| HAR |
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HTTP Archive |
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| HARP |
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Hackers Against Racial Parties |
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| HASCS |
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Harvard Arts and Sciences Computer Services |
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| HASP |
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Houston Automatic Spooling Priority |
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| HATEOAS |
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Hypermedia as the Engine of Application State |
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| HAVAL |
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Hash of Variable Length |
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| HBA |
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Host Bus Adapter |
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| HBFG |
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Host Behavior Functional Group (ATM Forum) |
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| HBO |
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Home Box Office |
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| HC |
|
Hybrid Coordinator |
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| HC |
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HyperChannel |
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| HCAP |
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Host Credential Authorization Protocol |
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| HCCB |
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High Capacity Color Barcode |
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| HCD |
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Hardware Configuration Definition |
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| HCDS |
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High Capacity Digital Service |
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| HCF |
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Halt and Catch Fire |
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| HCF |
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Hybrid Coordination Function |
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| HCFA |
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Health Care Financing Administration |
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| HCI |
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Host Controller Interface |
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| HCI |
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Human-Computer Interaction |
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| HCIG |
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Health Care Industry Group |
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| HCL |
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Hardware Compatibility List |
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| HCL |
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High Cross-Linkage |
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| HCL |
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Hop Count Limit |
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| HCM |
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Human Capital Management (system) |
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| HCO |
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High Capacity Output |
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| HCPCS |
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HCFA Common Procedural Coding System |
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| HCS |
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Hard Clad Silica |
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| HCS |
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Header Check Sequence |
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| HCSDS |
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High Capacity Satellite Digital Service |
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| HCSS |
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High-Capacity Storage System |
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| HCT |
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Hardware Compatibility Test |
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| HCTDS |
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High Capacity Terrestrial Digital Service |
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| HD |
|
Hard Disk (drive) |
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| HD |
|
Hard Drive |
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| HD |
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High Definition |
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| HD |
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High Density |
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| HDA |
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[Intel] High-Definition Audio |
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| HDA |
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Head Disk Assembly |
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| HDA |
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High Density Alloy |
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| HDB3 |
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High Density Bipolar - Three (zeros) |
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| HDC |
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Hard Disk Controller |
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| HDCP |
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High-Bandwidth Digital Content Protection |
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| HDD |
|
Hard Disk Drive |
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| HDD |
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High Definition Display |
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| HDD |
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High-Density Disk |
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| HDK |
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Hardware Development Kit |
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| HDL |
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Hardware Description Language |
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| HDLC |
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High-level Data Link Control |
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| HDMI |
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High Definition Multimedia Interface |
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| HDML |
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Handheld Device Markup Language |
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| HDSC |
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High Density Signal Carrier |
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| HDSL |
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High-bit-rate Digital Subscriber Line |
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| HDTP |
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Handheld Device Transport Protocol |
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| HDTV |
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High Definition Television |
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| HDVP |
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High Definition Video Processor |
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| HDX |
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Half Duplex |
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| HE |
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Head End |
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| HEAP |
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Home Energy Assistance Program |
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| HEC |
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Header Error Check / Header Error Control |
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| HECI |
|
Host Embedded Controller Interface |
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| HEDIS |
|
Healthplan Employer Data and Information Set |
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| HEHO |
|
High End Hop Off |
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| HEL |
|
Header Extension Length |
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| HEMP |
|
High - altitude ElectroMagnetic Pulse |
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| HEMS |
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High - Level Entity Management System / High - Level Entity Monitoring System |
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| HENCE |
|
Heterogeneous Network Computing Environment (usually as HeNCE) |
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| HEP |
|
High Energy Physics |
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| HEP |
|
Hub Expansion Port |
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| HEPNET |
|
High Energy Physics NETwork |
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| HERT |
|
Hacker Emergency Response Team |
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| HETLA |
|
Highly Extended Three Letter Acronym |
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| HEU |
|
Hacking at the End of the Universe (convention) |
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| HEX |
|
Hexadecimal (base 16) |
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| HF |
|
Have Fun |
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| HF |
|
High Frequency |
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| HF |
|
Human Factors |
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| HFC |
|
Hybrid Fiber Coax |
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| HFG |
 |
H4CK1NG F0R G1RL13Z (translated as Hacking For Girlies) |
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| HFS |
|
Hardware Functionality Scan |
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| HFS |
|
Hierarchical File System |
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| HFSC |
|
Hierarchical Fair Service Curve |
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| HGC |
 |
Hercules Graphics Card |
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| HHOJ |
|
Ha Ha Only Joking |
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| HHOK |
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Ha Ha Only Kidding |
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| HHS |
 |
(Department of) Health and Human Services |
|
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| HIBCC |
 |
Health Industry Business Communications Council |
|
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| HIC |
|
Hybrid Integrated Circuit |
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| HICOM |
|
High technology Communication |
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| HID |
|
Human Interface Device |
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| HID/LOD |
|
High-Density / Low-Density (tariff) |
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| HIDS |
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Host-based Intrusion Dectection System |
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| HI-FI |
|
High-Fidelity |
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| HILI |
|
Higher - Level Interface |
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| HIPAA |
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Health Insurance Portability and Accountability Act |
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| HIPO |
|
Hierarchy plus Input - Process - Output (charts) |
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| HIPPI |
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High-Performance Parallel Interface |
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| HIS |
 |
Host Integration Server |
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| HIT |
 |
Hackers In Touch |
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| HITECH |
 |
Health Information Technology for Economic and Clinical Health (Act) |
|
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|
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| HIWTH |
|
Hate It When That Happens |
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| HL7ECF |
 |
Health Level Seven Enterprise Communications Framework |
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| HLA |
 |
High-Level Architecture (IEEE Standard 1516) |
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| HLA |
 |
High-Level Assembly |
|
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|
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| HLL |
 |
High Level Language (API) |
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| HLLAPI |
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High Level Language Application Programming Interface |
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| HLPI |
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Higher Layer Protocol Identifier |
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| HLR |
|
Home Location Register |
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| HLSL |
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High-Level Shading Language / High-Level Shader Language |
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| HMA |
|
High Memory Area |
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| HMAC |
|
Hash Message Authentication Code (FIPS 198-1) |
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| HMAC |
|
Hashing for Message Authentication Calculator |
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| HMD |
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Head Mounted Display |
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| HMI |
|
Horizontal Motion Index |
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| HMI |
|
Hub Management Interface |
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| HMI |
|
Human - Machine Interface |
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| HML |
|
Human - Machine Language |
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| HMP |
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Heterogeneous MultiProcessing (architecture) |
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| HMP |
|
Host Monitoring Protocol |
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| HMUX |
|
Hybrid Multiplexer |
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| HN |
|
Host to Network |
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| HN |
|
Hungarian Notation |
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| HNDS |
|
Hybrid Network Design System |
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| HNPA |
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Home Numbering Plan Area |
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| HNS |
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Hospitality Network Service |
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| HOB |
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Hierarchical Operational Binding |
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| HOBIC |
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Hotel Billing Information Center |
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| HOBIS |
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Hotel Billing Information System |
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| HOL |
|
Head Of Line |
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| HOL |
|
Higher Order Logic |
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| HOPE |
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Hackers On Planet Earth (conference) |
|
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|
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| HOTS |
|
Higher Order Thinking Skills |
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| HP |
 |
Hewlett Packard |
|
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| HPA |
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High-Performance Addressing |
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| HPA |
|
Host Protected Area |
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| HPAD |
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Host Packet Assembler / Disassembler |
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| HPC |
|
Handheld Personal Computer |
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| HPC |
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High Performance Computing |
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| HPCA |
|
High Performance Computing Act |
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| HPCC |
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High Performance Computing and Communications program |
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| HPCCIT |
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High Performance Computing, Communication, and Information Technology |
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| HPD |
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Hot Plug Detect |
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| HPET |
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High Precision Event Timer |
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| HPFC |
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High Performance Functional Computing |
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| HPFS |
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High Performance File System |
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| HPGL |
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Hewlett Packard Graphics Language |
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| HP-GL |
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Hewlett Packard Graphics Language |
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| HPIB |
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Hewlett Packard Interface Bus |
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| HPIUGA |
 |
Hewlett Packard International Users Group Association |
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| HPM |
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High Power Microwave |
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| HPNA |
|
Home Phone Network Adapter |
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| HPO |
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High Performance Option |
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| HPO |
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High-volume Page Output |
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| HPOFS |
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High Performance Optical File System |
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| HPPPN |
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Hewlett Packard Private Packet Network |
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| HPR |
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High Performance Routing |
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| HPS |
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Hardware Product Services |
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| HPS |
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High Performance Systems |
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| HPSB |
|
High Performance Serial Bus |
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| HPSS |
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High Performance Switching System |
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| HQ |
|
Headquarters |
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| HR |
|
Hour (usually as Hr or hr) |
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| HR |
|
Human Resources |
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| HR |
|
Human Rights |
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| HRA |
|
Health Registration Authority |
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| HRC |
|
Hybrid Ring Control |
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| HRH |
 |
Her Royal Highness |
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| HRIS |
|
Human Resource Information System |
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| HRPF |
|
Hexadecimal Reference Publication Format |
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| HRTF |
|
Head Related Transfer Function |
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| HRU |
 |
Hackers 'R' Us |
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| HS |
|
HyperSpectral |
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| HSC |
|
Hierarchical Storage Controller |
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| HSDC |
|
High - Speed Data Card |
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| HSDL |
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High-Speed Data Link |
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| HSF |
|
High Sierra Format |
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| HSG |
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HATS String Generator |
|
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| HSIM |
 |
High Speed Interface Module (W6) |
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| HSLAN |
|
High - Speed Local Area Network |
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| HSM |
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Hierarchical Storage Management |
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| HSPA |
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High-Speed Packet Access (sometimes as HSPA+) |
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| HSPD |
 |
(U.S.) Homeland Security Presidential Directive |
|
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|
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| HSSDS |
|
High - Speed Switched Digital Service |
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| HSSI |
|
High - Speed Serial Interface |
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| HSSP |
 |
High Speed Switched Port |
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| HST |
 |
High-Speed Transfer (protocol) |
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| HSTS |
 |
HTTP Strict Transport Security (RFC 6797) |
|
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|
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| HSV |
|
Hue, Saturation, and Value (color model) |
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| HT |
|
Horizontal Tabulation (ASCII) |
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| HTA |
 |
HTML Application (also has the .hta file extension) |
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| HTC |
 |
High-Tech Computer (Corporation) |
|
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| HTC |
|
Hit The Cell |
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| HTCIA |
 |
High Tech Computer Investigators Association |
|
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| HTH |
|
Happy To Help |
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| HTH |
|
Hope This Helps / Hope That Helps |
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| HTML |
 |
HyperText Markup Language |
|
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| HTTP |
 |
HyperText Transport Protocol |
|
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| HTTPD |
|
HyperText Transfer Protocol Daemon |
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| HTTPS |
|
HyperText Transfer Protocol over SSL |
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| HTX |
 |
HTML Extension |
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| HU |
|
High Usage |
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| HUTG |
|
High Usage Trunk Group |
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| HVAC |
|
Heating, Ventilation and Air Conditioning |
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| HVD |
|
High Voltage Differential (SCSI Standard based on EIAA 485) |
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| HVM |
|
High Volume Manufacturing |
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| HVQFN |
|
Heatsink Very-thin Quad Flat-pack No-leads |
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| HW |
|
HardWare |
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| HWA |
|
Host Wire Adapter |
|
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| HWG |
 |
HTML Writers Guild |
|
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| HXRI |
 |
HTTP Extensible Resource Identifier |
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| HZ |
|
Hertz (usually as Hz) |
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