| Nom | Description |
| H&J | Hyphenation & Justification |
| H/PC | Hand-held Personal Computer |
| H/V | Horizontal/Vertical |
| H/W | Hardware |
| H324 | Video Conferencing standard |
| H4P | High Performance Parallel Processing Project |
| H |
| Header |
| Henry ( inductance ) |
| Hexadecimal (sometimes as lowercase h) |
| High ( level ) |
| HA | House Automation |
| HAARP | High Frequency Active Auroral Research Program |
| HACMP |
| High Availability Clustered Multi Processing "IBM, RS/6000, Bull","HA/CMP" |
| [AIX] High Availability Cluster Multi-Processing |
| HAD | Hole Accumulating Diode |
| HAE | High Altitude, long Endurance (UAV) |
| HAI | Hardware Accelerator Interface |
| HAKMEM | Hacks Memo |
| HAL |
| Hard Array Logic |
| Hardware Abstraction Layer |
| Hardware Abstraction Layer "Windows NT" |
| Heuristically Programmed Algorithmic |
| Hot Air Levelling |
| House Programmed Array Logic |
| HALE | Hacker's Against Law Enforcement |
| HALPC | Houston Area League of PC Users, "HAL PC" |
| HALT | Highly Accelerated Life Testing |
| HAM |
| Hierarchical Access Method |
| High Availability Manager |
| Hybrid Access Method |
| HAMPS | Host AUTODIN Message Processing System AUTODIN, mil. |
| HAN | Hydroxylammonium Nitrate |
| HAND | Have A Nice Day |
| HANFS | Highly Available Network File System |
| HAP |
| High Altitude Platform [ aeroplane, helicopter or airship operating in the stratosphere at an altitude of about 21km ] |
| Host Access Protocol |
| HARM |
| High Aspect Ratio MEMS |
| High Speed Anti Radiation Missile |
| HART | Highway Addressable Remote Transducer |
| HAS | High Availability Subsystem |
| HASCS | Harvard Arts and Sciences Computer Services |
| HASP |
| Houston Automatic Spooling Priority |
| Houston Automatic Spooling Program |
| HASS | Highly Accelerated Stress Screening |
| HAT | Hashed Address Table |
| HATP | High Availability Transaction Processing |
| HAZOPS | HAZard and OPerability Study |
| HB | Harmonic Balance ( simulation ) |
| HBA | Host Bus Adapter |
| HBC | High Breaking Capacity ( fuse ) |
| HBCI |
| Home Banking Computer Interface |
| HomeBanking Computer Interface Internet, banking |
| HBCU/MI | Historically Black Colleges and Universities/Minority Institutions |
| HBFG | Host Behavior Functional Group (ATM Forum) |
| HBM | Human Body Model ( ESD ) |
| HBO | Home Box Office |
| HBT |
| Heterojunction Bipolar Transistor |
| Heterojunction Bipolar Transistor [ SiGe and InGaAs/GaAs transistors ] |
| HC |
| High speed CMOS |
| HyperChannel |
| HCA |
| High Contrast Addressing |
| High Contrast Addressing ( LCD ) |
| HCDS | High Capacity Digital Service |
| HCF |
| HART Communication Foundation |
| Halt and Catch Fire |
| High Cycle Fatigue |
| Host Command Facility |
| HCFA | Health Care Financing Administration |
| HCFC | HydroChloroFluoroCarbon |
| HCFT | Hot Cathode Fluorescent Tube |
| HCI |
| Host Controller Interface |
| Hot Carrier Induced ( degradation ) |
| Human Computer Interaction BCS, conference |
| Human Computer Interface |
| HCIG | Health Care Industry Group |
| HCL |
| Hardware Compatibility List |
| Hop Count Limit |
| Host Control Links |
| HCM | Hard Core Monitor |
| HCMOS |
| High Density Complimentary Metal Oxide Semiconductor |
| High Speed Complementary Metal Oxide Semiconductor |
| HCO | High Capacity Output |
| HCP |
| Host Command Processor |
| Host Communication Processor |
| HCPCS | HCFA Common Procedural Coding System |
| HCPLD | High Capacity Programmable Logic Device |
| HCR | High Contrast Reflection ( display ) |
| HCS |
| Hard Clad Silica |
| Header Check Sequence |
| HCSDS | High Capacity Satellite Digital Service |
| HCSS |
| High Capacity Storage System |
| High-Capacity Storage System |
| HCT |
| Hamburger ComputerTage fair |
| Hard Copy Task |
| High speed CMOS [logic] with TTT compatible [logic] levels |
| HCTDS | High Capacity Terrestrial Digital Service |
| HCU | Home Computer User |
| HD CIF | High Definition Common Image Format ( 1080 by 1920 matrix HDTV ) |
| HD PQFP | High Density Plastic Quad Flatpack |
| HD |
| Half Duplex |
| Hard Disk |
| Hard Disk (drive) |
| Hard Drive |
| Harmonizing Document ( EN ) |
| Head |
| Help Desk |
| High Density |
| HDA | Head Disk Assembly |
| HDAM | Hierarchical Direct Access Method |
| HDB3 |
| High Density Bipolar - Three (zeros) |
| High Density Bipolar 3 |
| HDB | HoneyDanBer [standard] |
| HDBMS | Hierachical DataBase Management System |
| HDBV | Host Database View |
| HDC | Hard Disk Controller |
| HDCD |
| High Definition Compatible Digital |
| High Density Compact Disk |
| HDD | Hard Disk Drive |
| HDE | Humanitarian Device Exemption |
| HDF | Hierarchical Data Format |
| HDH | HDLC Distant Host |
| HDI F | Help Desk Institute Francophone |
| HDI |
| HOOPS Device Interface |
| Head to Disk Interference |
| Help Desk Institute |
| High Density Interconnect |
| HDL | Hardware Description Language |
| HDLC |
| High level Data Link Control |
| High-level Data Link Control |
| HDM |
| Hardware Device Module |
| High Memory Area |
| HDML | Handheld Device Markup Language |
| HDN | Hochgeschwindigkeits DatenNetz |
| HDR |
| Header |
| High Dynamic Range |
| High availability Data Replication |
| HDS | Hitachi Data Systems |
| HDSC | High Density Signal Carrier |
| HDSL |
| "See DSL" |
| High Bit Rate Digital Subscriber Line |
| High Data Rate Digital Subscriber Line |
| High bit rate Digital Subscriber Loop |
| High data / bit rate Digital Subscriber Line |
| High level Data Specification Language |
| High rate Digital Subscriber Link |
| High-bit-rate Digital Subscriber Line |
| HDSS | Holographic Data Storage System |
| HDT |
| Hard Disk Toolkit |
| Host Digital Terminal |
| HDTP | Handheld Device Transport Protocol |
| HDTV | High Definition Television |
| HDVD | High Definition Volumetric Display |
| HDVT |
| Hybrid Dual Threshold Voltage ( circuit ) |
| Hybrid Hierarchical Reduced Swing Logic |
| HDW | Hardware |
| HDX | Half Duplex |
| HE | HöhenEinheit ( 44.45 mm, 19'' System ) |
| HEA | Hyundai Electronics of America manufacturer |
| HEAP | Home Energy Assistance Program |
| HEB | Home Electronics Bus |
| HEC |
| Header Error Check |
| Header Error Check / Header Error Control |
| Header Error Control |
| Header Error Control ( ATM ) |
| HECTOR | HEterogeneous Computer TOgetheR IBM, Uni Karlsruhe, Germany |
| HEDIS | Healthplan Employer Data and Information Set |
| HEDM | High Energy Density Matter |
| HEE | Hyundai Electronics Europe ( Ltd. Halbreath Scotland UK ) |
| HEGIAS | Host for Experimental Graphical Interface of Advanced automation System |
| HEHO | High End Hop Off |
| HEI | High Energy Implantation |
| HEL |
| Hardware Emulation Layer |
| Header Extension Length |
| High Energy Laser |
| Human Engineering Lab ( Boston MA ) |
| HELSTF | High Energy Laser Test Facility |
| HEML | High Energy Microwave Laboratory |
| HEMP | High - altitude ElectroMagnetic Pulse |
| HEMS | High - Level Entity Management System / High - Level Entity Monitoring System |
| HEMT | High Electron Mobility Transistor |
| HENCE | Heterogeneous Network Computing Environment (usually as HeNCE) |
| HEOS | High Earth Orbiting Satellite |
| HEP |
| High Energy Physics |
| Hub Expansion Port |
| HEPNET |
| High Energy Physics NETwork |
| High Energy Physics NETwork network |
| HERC | Hercules |
| HERMES | Heuristic Emergency Response Management Expert System |
| HERODE | Handling the Electronic Representation of mixed text image OfficeDocuments based on ECMA standard 101 |
| HES | Home Electronic System |
| HETLA | Highly Extended Three Letter Acronym |
| HEU | Hacking at the End of the Universe (convention) |
| HEX | Hexadecimal |
| HEXIS | Heat EXchange Integrated Stack ( fuel cells, Sulzer Innotek, Winterthur Switzerland ) |
| HF |
| Hawthorne Farms |
| High Frequency |
| HFC |
| Hybrid Fiber Coax |
| Hybrid Fiber Coaxial |
| Hybrid Fiber/Coax ( technology ) |
| HydroFluoroCarbon |
| HFD | Hauptanschluss fuer Direktruf / Datenleitung "Telekom", "HfD" |
| HFDS | Highly Functional Distributed System |
| HFET | Heterostructure Field Effect Transistor |
| HFS |
| Hierachical File System |
| Hierarchical File System |
| HFSS | High Frequency Structure Simulator ( Agilent ) |
| HFT | High Function Terminal |
| HGA | Hercules Graphics Adapter |
| HGC |
| Hercules Graphic Card |
| Hercules Graphics Card |
| HGCP | Hercules Graphics Card Plus |
| HGED | High Gain Emissive Display |
| HGML | Hypertext General Markup Language |
| HGOPHER | High class Gopher |
| HH | Hour |
| HHC | Hand Held Computer |
| HHI |
| Heinrich Hertz Institut |
| Heinrich Hertz Institut ( Berlin Germany ) |
| HHOK | Ha Ha Only Kidding |
| HHOS | Ha Ha Only Serious |
| HHP |
| Hand Held Programmer |
| HochleistungsHeizPatrone |
| HHS | (Department of) Health and Human Services |
| HHT | Hand Held Terminal |
| HI | Hochschulverband Informationswissenschaften org. |
| HIBCC | Health Industry Business Communications Council |
| HIC |
| Heterogenous InterConnect |
| Human Interaction Component |
| Hybrid Integrated Circuit |
| HICOM | High technology Communication |
| HID/LOD | High-Density / Low-Density (tariff) |
| HID |
| Human Input Device |
| Human Interface Device |
| HIDAM | Hierarchical Indexed Direct Access Method |
| HIDM | High Information Delta Modulation |
| HIF | Hyper G Interchange Format |
| HIFD |
| HIgh capacity Floppy Disk "Sony, Fuji", "HiFD" |
| High capacity Floppy Disk |
| High density Floppy Disk |
| HIFI | Hypertext Interface For Information |
| HIFIPI | High Fidelity Picture |
| HIFIVE | HIgh Fidelity Interactive Visual Environment "DEC", "Hi FIVE" |
| HIFT | Hardware Implemented Fault Tolerance |
| HIGGENS | Human Interface Graphical GENeration System |
| HIL |
| Hardware In the Loop ( simulation ) |
| Human Interface Link |
| HILI | Higher - Level Interface |
| HIMA | Health Industry Manufacturers Association |
| HIMEM | High Memory |
| HINET | "Digital Microsystems Inc. Network" |
| HINT | Hierachical INTegration [benchmark] |
| HIP | Heiß Isostatische Preßbehandlung |
| HIPO |
| Hierarchy Input Process Output |
| Hierarchy plus Input - Process - Output (charts) |
| HIPPI |
| High Performance Parallel Interface |
| High Performance Peripheral Interface |
| High-Performance Parallel Interface |
| HIPRA | High Speed Digital Processor Architecture |
| HIRD | HURD of Interface Representing Depth |
| HIRF | High Intensity Radiation Fields |
| HIROS | Hitachi Industrial Realtime Operating System |
| HISAM | Hierarchical Indexed Sequential Access Method |
| HISP | HIgh SPeed channel connector |
| HIT | Hackers In Touch |
| HKIGS | Hong Kong Internet and Gateway Services |
| HKIX | Hong Kong Internet Exchange |
| HKTDC | HongKong Trade Development Council |
| HL7ECF | Health Level Seven Enterprise Communications Framework |
| HLC |
| High Level Center |
| Hybrid Layer Capacitor |
| HLCO | High Low Close Open |
| HLD | High Level Design |
| HLDA | High Level Design Automation |
| HLL |
| High Level Language |
| High Level Language (API) |
| High Level Logic |
| HLLAPI | High Level Language Application Programming Interface |
| HLP | Help "file name extension" |
| HLPI | Higher Layer Protocol Identifier |
| HLPS | Hot Liquid Process Simulator |
| HLQ | High Level Qualifier |
| HLR |
| Home Location Register |
| Home Location Register ( GSM ) |
| HLRS | HochLeistungsRechenzentrum Stuttgart ( Germany ) |
| HLS |
| Hue Luminance Saturation |
| Hue, Luminance, Saturation color system, DTP |
| HLT | Halt |
| HM | Hard Metric ( connector ) |
| HMA |
| High Memory Area |
| Hub Management Architecture |
| HMAC | keyed Hashing for Message AuthentiCation cryptography, RFC 2104 |
| HMC | Highspeed Memory Controller |
| HMD |
| Head Mounted Device |
| Head Mounted Display |
| HMI |
| Horizontal Motion Index |
| Host Micro Interface |
| Hub Management Interface |
| Human - Machine Interface |
| Human Machine Interface |
| HML | Human - Machine Language |
| HMM | Hidden Markov Model |
| HMMP |
| Hyper Media Management Protocol |
| HyperMedia Management Protocol |
| HMMS | HyperMedia Management Schema |
| HMOM | HyperMedia Object Manager |
| HMOS |
| High Speed Metal Oxide Semiconductor |
| High density Metal Oxide Semiconductor |
| High performance Metal Oxide Semiconductor |
| HMP | Host Monitoring Protocol |
| HMT/D | Helmet Mounted Tracker and Display |
| HMTI | Hana Microdisplay Technologies Inc. ( Twinsburg OH ) |
| HMUX |
| Hybrid MUltipleXer "FDDI", "H MUX" |
| Hybrid Multiplexer |
| HN | Host to Network |
| HNDS | Hybrid Network Design System |
| HNF | Heinz Nixdorf Museumsforum |
| HNI | Heinz Nixdorf Institut |
| HNIL | High Noise Immunity Logic |
| HNPA | Home Numbering Plan Area |
| HNR | Handwritten Numeral Recognition |
| HNS | Hospitality Network Service |
| HOB | Hierarchical Operational Binding |
| HOBA | High Off Boresight Angle |
| HOBIC | Hotel Billing Information Center |
| HOBIS | Hotel Billing Information System |
| HOF | Head Of Form |
| HOIE | Holographic Optical Interconnect Element |
| HOL |
| Havas On Line |
| Head Of Line |
| Head Of Line ( blocking, Ethernet ) |
| High Order Language |
| HOLAP | Hybrid OLAP |
| HOOD | Hierarchical Object Oriented Design |
| HOOPS | Hierachical Object Orientated Picture System |
| HOTAS | Hands On Throttle and Stick |
| HOTS | Higher Order Thinking Skills |
| HOTT | Hot Off The Tree |
| HOV | High Occupancy Vehicle |
| HP MSOGS | High Performance Molecular Sieve Oxygen Generation System |
| HP-GL | Hewlett Packard Graphics Language |
| HP |
| Hewlett Packard |
| Hewlett Packard ( Co. Cupertino CA ) |
| Hewlett Packard manufacturer |
| High Performance |
| HPA | High Performance Addressing ( LCD ) |
| HPAD | Host Packet Assembler / Disassembler |
| HPBIDS | Hewlett Packard Broadband Internet Delivery System "HP, Internet", "HPBIDS" |
| HPC |
| Handheld Personal Computer |
| High Performance Computing |
| High Pressure Compressor |
| HPCA | High Performance Computing Act |
| HPCC |
| High Performance Computing and Communication |
| High Performance Computing and Communications |
| High Performance Computing and Communications program |
| HPCCIT | High Performance Computing, Communication, and Information Technology |
| HPCL | HP Printer Control Language |
| HPCS | Hifh Performance Communication Server |
| HPDJ | Hewlett Packard Desk Jet |
| HPF | High Performance FORTAN |
| HPFC | High Performance Functional Computing |
| HPFS |
| High Performance File System |
| High Performance File System ( OS/2 ) |
| High Performance FileSystem |
| HPG | Hewlett Packard Graphics |
| HPGL |
| Hewlett Packard Graphics Language |
| High Performance Graphic Language |
| HPIB | Hewlett Packard Interface Bus |
| HPIUGA | Hewlett Packard International Users Group Association |
| HPLJ | Hewlett Packard Laser Jet |
| HPLT | High Productivity Languages/Tools |
| HPM |
| High Power Microwave |
| Hyper Page Mode |
| HPO | High Performance Option |
| HPOFS | High Performance Optical File System |
| HPOM | Home Page Objects Model |
| HPP | High Performance Packaging |
| HPPA | Hewlett Packard Precision Architecture |
| HPPCL | Hewlett Packard Printer Control Language |
| HPPI | High Performance Parallel Interface |
| HPPPN | Hewlett Packard Private Packet Network |
| HPR |
| High Performance Routing |
| High Priority Request |
| HPS |
| Hardware Product Services |
| High Performance Schnecke ( Krauss Maffei AG München Germany ) |
| High Performance Systems |
| HPSB | High Performance Serial Bus |
| HPSC | High Performance Scalable Computer |
| HPSLT | High Power Semiconductor Laser Technology |
| HPSS | High Performance Switching System |
| HPT | High Pressure Turbine |
| HPTS | High Performance Transaction Systems |
| HPUX |
| Hewlett Packard / UniX "Unix", "HP/UX" |
| Hewlett Packard Unix |
| HPVEE | Hewlett Packard ??? "HP", "HP VEE" |
| HPVUE | Hewlett Packard Visual User Environment "HP, GUI", "HP VUE" |
| HPW | High Performance Workstation |
| HQ |
| Headquarters |
| High Quality |
| HQX |
| BinHex "file name extension" "Macintosh" |
| BinHex file extension |
| HR TFT | High Reflective Thin Film Transistor ( LCD ) |
| HR |
| High Resolution |
| Horizontal Rule |
| Human Resources |
| HRC |
| High Rupturing Capacity ( fuse ) |
| Hybrid Ring Control |
| HRG | High Resolution Graphics |
| HRIS | Human Resource Information System |
| HRMS | Human Resource Management System |
| HRPF | Hexadecimal Reference Publication Format |
| HRTF | Head Related Transfer Function |
| HRU | Hackers 'R' Us |
| HS |
| Hierarchic Sequential |
| High Speed |
| HSA | High Speed Access |
| HSAL | High Speed Algebraic Logic |
| HSAM | Hierarchic Sequential Access Method |
| HSB | Hue Saturation Brightness |
| HSC TV | Home Shopping Club Television |
| HSC |
| Hierarchical Storage Controller |
| High Speed Channel |
| Human Systems Center |
| HSCSD |
| High Speed Circuit Switched Data |
| High Speed Circuit Switched Data ( GSM ) |
| HSDC | High - Speed Data Card |
| HSE |
| Health and Safety Executive |
| High Speed Ethernet |
| HSF | High Sierra Format |
| HSFS | High Sierra File System |
| HSI |
| High Speed Input |
| High Speed Interface |
| Hue Saturation Intensity |
| Hue, Saturation, Intensity |
| Hyperspectral Imaging |
| HSIM | High Speed Interface Module (W6) |
| HSIO | High Speed Input/Output |
| HSIP | Hsinchu Science based Industrial Park ( Taiwan ) |
| HSIS | High Speed Interface / SNA, "HSI/S" |
| HSL |
| Hue Saturation Lightness |
| Hue, Saturation, Luminescence ( color scheme ) |
| HSLAN |
| High - Speed Local Area Network |
| High Speed Local Area Network, "HS LAN" |
| HSLFX | ??? [hardware desription language] "HDL, NTT, LSI", "HSL FX" |
| HSLN | High Speed Local Network |
| HSM |
| Hardware Specific Module |
| Hierarchical Storage Management |
| Hierarchisches SpeicherManagement |
| High Speed Memory |
| HSO | High Speed Output |
| HSP |
| High Speed Printer |
| High Speed Printer/Processor |
| Host Signal Processing |
| HSR |
| High Speed Reader |
| High Speed Research |
| HSRP | Hot Standby Router Protocol |
| HSSDC | High Speed Serial Data Connector |
| HSSDS |
| High - Speed Switched Digital Service |
| High Speed Switched Digital Service |
| HSSI |
| High - Speed Serial Interface |
| High Speed Serial Interface |
| HSSN | HighSpeed Switching Network |
| HSSP | High Speed Switched Port |
| HST |
| Hawaiian Standard Time [ 1030] |
| High Soft Tech manufacturer, ISDN |
| High Speed Technology |
| History |
| Host "file name extensions" |
| Hyper Sonic Transport |
| HSTL | High Speed Transceiver Logic |
| HSTR | High Speed Token Ring |
| HSV | Hue Saturation Value |
| HT |
| Horizontal Tab |
| Horizontal Tabulation (ASCII) |
| Horizontal Tabulator ( ASCII control code ) |
| HTCC | High Temperature Cofired Ceramic |
| HTCIA |
| High Tech Computer Investigators Association |
| High Tech Crime Investigation Association |
| HTDM | Hybrid Time Division Multiplexing [protocol] |
| HTF | Hyper g Text Format |
| HTH |
| Hope This Helps |
| Hope This Helps ( net slang ) |
| Hope This Helps slang |
| HTL | High Threshold Logic |
| HTML | HyperText Markup Language |
| HTS | High Temperature Superconductivity |
| HTTP NG | HTTP Next Generation |
| HTTP |
| HyperText Transfer Protocol |
| HyperText Transport Protocol |
| HyperText Transport/Transfer Protocol |
| HTTPD | HyperText Transfer Protocol Daemon |
| HTTPNG | HyperText Transfer Protocol Next Generation "WWW", "HTTP NG" |
| HTTPS |
| HyperText Transfer Protocol Secure |
| HyperText Transport Protocol Server |
| HTX | HTML Extention |
| HU | High Usage |
| HUD |
| Head Up Display |
| Heads Up Display |
| HUGO | Holland User Group for OS/2 |
| HULK | Help Universal Kit |
| HUM | Hold Up Module |
| HUP | Hang UP |
| HURD | HIRD of Unix Replacing DAEMONs |
| HUT |
| Helsinki University of Technology ( Finland ) |
| Hopkins Ultraviolet Telescope |
| HUTG | High Usage Trunk Group |
| HV | High Voltage |
| HVAC |
| Heating Ventilation Air Conditioning |
| Heating, Ventilating, and Air Conditioning |
| Heating, Ventilation and Air Conditioning |
| HVC |
| Hue Value Chroma |
| Hue Value Chroma [model] |
| HVD |
| High Voltage Differential |
| High Voltage Differential [technology] |
| HVIC | High Voltage Integrated Circuit |
| HVL | Hardware Verification Language |
| HVM | High Volume Manufacturing |
| HVP | Horizontal & Vertical Position |
| HW/SW | HardWare/SoftWare ( interface ) |
| HW | HardWare |
| HWCP | Hardware Code Page |
| HWD | Height Width Depth |
| HWDM | Hyperfine Wave Division Multiplexing |
| HWDMS | Hazardous Waste Data Management System |
| HWG | HTML Writers Guild |
| HYP | Hyphenation "file name extension" |
| HYTEA | HYperText Environment for Authoring |
| HYTELNET | Hypertext browser for Telnet Accessible Sites |
| HYTIME |
| Hypermedia and Time based |
| Hypermedia/Time based structuring language "SGML, ISO, IEC, IS 10744","HyTime" |
| HYVIS | Hypermedia and Visual Information System |
| HZ | Hertz (usually as Hz) |
| HiMAT | Highly Maneuverable Aircraft Technology |
| HiMaTE | High Mach Turbine Engine |
| HySTP | Hypersonic Systems Technology Program |
| HyTech | Hypersonic Technology |
| Hz | Hertz |