| Acronym | Definition | External Links | |
| H |
Hexadecimal (sometimes as lowercase h) |
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| H/PC |
Hand-held Personal Computer |
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| HA |
High Availability / Highly Available |
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| HAARP |
High-frequency Active Auroral Research Program |
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| HACMP |
[AIX] High Availability Cluster Multi-Processing |
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| HAL |
Hardware Abstraction Layer |
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| HALE |
Hacker's Against Law Enforcement |
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| HAM |
Hybrid Access Method |
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| HAND |
Have A Nice Day |
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| HARP |
Hackers Against Racial Parties |
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| HASCS |
Harvard Arts and Sciences Computer Services |
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| HASP |
Houston Automatic Spooling Priority |
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| HATEOAS |
Hypermedia as the Engine of Application State |
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| HAVAL |
Hash of Variable Length |
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| HBA |
Host Bus Adapter |
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| HBFG |
Host Behavior Functional Group (ATM Forum) |
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| HBO |
Home Box Office |
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| HC |
Hybrid Coordinator |
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| HC |
HyperChannel |
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| HCAP |
Host Credential Authorization Protocol |
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| HCCB |
High Capacity Color Barcode |
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| HCD |
Hardware Configuration Definition |
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| HCDS |
High Capacity Digital Service |
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| HCF |
Halt and Catch Fire |
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| HCF |
Hybrid Coordination Function |
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| HCFA |
Health Care Financing Administration |
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| HCI |
Host Controller Interface |
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| HCI |
Human-Computer Interaction |
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| HCIG |
Health Care Industry Group |
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| HCL |
Hardware Compatibility List |
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| HCL |
Hop Count Limit |
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| HCO |
High Capacity Output |
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| HCPCS |
HCFA Common Procedural Coding System |
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| HCS |
Hard Clad Silica |
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| HCS |
Header Check Sequence |
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| HCSDS |
High Capacity Satellite Digital Service |
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| HCSS |
High-Capacity Storage System |
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| HCT |
Hardware Compatibility Test |
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| HCTDS |
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 |
High Definition |
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| HD |
High Density |
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| HDA |
[Intel] High-Definition Audio |
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| HDA |
Head Disk Assembly |
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| HDB3 |
High Density Bipolar - Three (zeros) |
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| HDC |
Hard Disk Controller |
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| HDCP |
High-Bandwidth Digital Content Protection / High-Bandwidth Digital Copy Protection |
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| HDD |
Hard Disk Drive |
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| HDD |
High Definition Display |
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| HDD |
High-Density Disk |
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| HDK |
Hardware Development Kit |
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| HDL |
Hardware Description Language |
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| HDLC |
High-level Data Link Control |
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| HDMI |
High Definition Multimedia Interface |
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| HDML |
Handheld Device Markup Language |
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| HDSC |
High Density Signal Carrier |
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| HDSL |
High-bit-rate Digital Subscriber Line |
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| HDTP |
Handheld Device Transport Protocol |
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| HDTV |
High Definition Television |
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| HDVP |
High Definition Video Processor |
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| HDX |
Half Duplex |
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| HE |
Head End |
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| HEAP |
Home Energy Assistance Program |
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| HEC |
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 |
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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| 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 |
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 |
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 |
Health Insurance Portability and Accountability Act |
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| HIPO |
Hierarchy plus Input - Process - Output (charts) |
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| HIPPI |
High-Performance Parallel Interface |
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| HIS |
Host Integration Server |
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| HIT |
Hackers In Touch |
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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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| HLL |
High Level Language (API) |
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| HLLAPI |
High Level Language Application Programming Interface |
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| HLPI |
Higher Layer Protocol Identifier |
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| HLR |
Home Location Register |
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| HMA |
High Memory Area |
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| HMAC |
Hash Message Authentication Code |
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| HMAC |
Hashing for Message Authentication Calculator |
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| HMD |
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 |
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 |
Home Numbering Plan Area |
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| HNS |
Hospitality Network Service |
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| HOB |
Hierarchical Operational Binding |
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| HOBIC |
Hotel Billing Information Center |
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| HOBIS |
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 |
Hackers On Planet Earth (conference) |
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| HOTS |
Higher Order Thinking Skills |
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| HP |
Hewlett Packard |
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| HPA |
Host Protected Area |
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| HPAD |
Host Packet Assembler / Disassembler |
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| HPC |
Handheld Personal Computer |
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| HPC |
High Performance Computing |
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| HPCA |
High Performance Computing Act |
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| HPCC |
High Performance Computing and Communications program |
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| HPCCIT |
High Performance Computing, Communication, and Information Technology |
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| HPD |
Hot Plug Detect |
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| HPET |
High Precision Event Timer |
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| HPFC |
High Performance Functional Computing |
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| HPFS |
High Performance File System |
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| HPGL |
Hewlett Packard Graphics Language |
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| HP-GL |
Hewlett Packard Graphics Language |
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| HPIB |
Hewlett Packard Interface Bus |
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| HPIUGA |
Hewlett Packard International Users Group Association |
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| HPM |
High Power Microwave |
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| HPNA |
Home Phone Network Adapter |
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| HPO |
High Performance Option |
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| HPO |
High-volume Page Output |
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| HPOFS |
High Performance Optical File System |
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| HPPPN |
Hewlett Packard Private Packet Network |
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| HPR |
High Performance Routing |
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| HPS |
Hardware Product Services |
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| HPS |
High Performance Systems |
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| HPSB |
High Performance Serial Bus |
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| HPSS |
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 |
High-Speed Data Link |
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| HSF |
High Sierra Format |
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| HSG |
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 |
Hierarchical Storage Management |
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| HSPA |
High-Speed Packet Access (sometimes as HSPA+) |
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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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| 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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| 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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