(Main list of acronyms and initialisms)

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• h - (s) Hecto
• H - (s) Henry - Hydrogen

HA

• ha - (s) Hectare
• HA - (s) Haiti (FIPS 10-4 country code)
• HA - (s) High Availability
• HAI - (i) Human Awareness Institute
• HAL - (i) Hardware Abstraction Layer
• HALO - (a) High Altitude Low Opening (parachute jump)
• HALT - (a) Hungry Angry Lonely Tired
• HANS - (a) Head And Neck Support (device used in many race cars)
• HARM - (a) High-speed Anti-Radiation Missile
• HAT - (i/a) Highest Astronomical Tide (nautical charts) - (a) Hungarian Automated Telescope
• HAW - (i) Heavy Antitank Weapon
• HAWK - (a) Homing All the Way Killer (air defence system)
• HAZ - (i) Heat-Affected Zone
• HAZMAT - (p) Hazardous Materials

HB

• HBO - (i) Home Box Office
• HBR - (i) Human Behaviour Representation
• HBT - (i) Heterojunction Bipolar Transistor
• HBV - (i) Hepatitis B Virus

HC

• h.c. - (i) honoris causa (Latin, "for the sake of honour")
• HCCI - (i) Homogeneous Charge Compression Ignition
• HCF - (i) Highest Common Factor
• HCI - (i) Human-Computer Interaction/Interface
• HCSC - (i) Higher Command and Staff Course
• HCT - (i) Higher Colleges of Technology, tertiary education institution in the United Arab Emirates (UAE)

HD

• HD - (i) Henry Draper (star catalogue) - Hull-Down (armoured vehicle target, as opposed to Fully Exposed)
• HDD - (i) Hard Disk Drive - High-Density Disk
• HDL - (i) High-Density Lipoprotein
• HDM - (i) Human Decision-Making
• HDRA - (i) Henry Doubleday Research Association
• HDTV - (p) High-Definition Television

HE

• He - (s) Helium
• HE - (a) High Explosive
• HEAT - (a) High Explosive Anti-Tank (ammunition)
• HEER - (a) High-Explosive Extended Range (ammunition)
• HEIC - (i) Honourable East India Company
• HEO - (a) Highly Elliptical Orbit
• HEOSS - (a) High Earth Orbit Space Surveillance
• HEPA - (a/i) High-Efficiency Particulate Air (filter)
• HESH - (a) High-Explosive Squash Head (ammunition)
• HESV - (i) Heavy Engineering Support Vehicle
• HETT - (a) Heavy Equipment Transporting Truck / Heavy Equipment Truck Tractor

HF

• Hf - (s) Hafnium
• HF - (i) High Frequency
• HFAC - (p) Human Factors ("aytchfak")
• HFE - (i) Human Fertilisation and Embryology (U.K. Act)
• HFEA - (i) Human Fertilisation and Embryology Authority (U.K.)

HG

• Hg - (i) Mercury (Latin Hydrargyrum)
• HGF - (i) Human Growth Factor

HH

• HHD - (p) humanitatum doctor (Latin, "doctor of humanities")

HI

• HI - (s) Hawaii (postal symbol)
• HIDACZ - (p) High-Density Airspace Control Zone ("high dak zed/zee")
• HIMAD - (p) High to Medium Altitude Air Defence (see also H/MAD)
• HIMEZ - (a) High Altitude Missile Engagement Zone
• HIPAA - (i) U.S. Health Insurance Portability and Accountability Act
• Hird - (a) Hurd of interfaces representing depth (cf. HURD)
• HiRISE - (p) High Resolution Imaging Science Experiment
• HIT - (a) Head Injection Technology
• HIV - (i) Human Immunodeficiency Virus
• HIWT - (i) Hobart Institute of Welding Technology

HJ

• HJ - (i) hic jacet (Latin, "here lies")
• HJD - (i) Heliocentric Julian Day

HK

• HK - (s) Hong Kong (ISO 3166 digram; FIPS 10-4 territory code)
• HKG - (s) Hong Kong (ISO 3166 trigram)
• HKS - (i) HyperKinetic Syndrome

HL

• hL - (s) Hectolitre
• HL - (i) Holding Line
• HLA - (i) High Level Architecture - Human Leukocyte Antigen
• HLL - (i) High-Level Language
• HLS - (i) hoc loco situs (Latin, "laid in this place")
• HLVW - (i) Heavy Logistics Vehicle, Wheeled

HM

• HM - (s) Heard and McDonald Islands (ISO 3166 digram; FIPS 10-4 territory code)
• H/MAD - (p) High/Medium Altitude Air Defence ("aytchmad"; see also HIMAD)
• HMCE - (i) Her Majesty's Customs and Excise
• HMCS - (i) Her Majesty's Canadian Ship or Her Majesty's Courts Service
• HMD - (s) Heard and McDonald Islands (ISO 3166 trigram)
• HMM - (i) Hidden Markov Model
• HMMWV - (i) High Mobility Multipurpose Wheeled Vehicle ("hum-vee"; "hummer")
• HMO - (i) Health Management Organization
• HMP - (i) Her Majesty's Prison
• HMS - (i) Helmet-mounted display - Her Majesty's Ship (Royal Navy)
• HMSO - (i) Her Majesty's Stationery Office
• HMV - (i) His Master's Voice

HN

• HN - (s) Honduras (ISO 3166 digram)
• HND - (s) Honduras (ISO 3166 trigram)

HO

• Ho - (s) Holmium
• HO - (s) Honduras (FIPS 10-4 country code)
• HOLLAND - (a) Hope Our Love Lasts And Never Dies
• HOPI - (a) Hybrid Optical and Packet Infrastructure (see Internet2, Abilene Network)
• HoReCa - (a) Hotel, Restaurant and Catering
• HORIZON - (p) Hélicoptère d'observation radar et d'investigation sur zone (French, Zone Investigation and Radar Observation Helicopter)
• HOSTAC - (a) Helicopter Operations from Ships Other Than Aircraft Carriers
• HOT - (a) Highly Optimised Tolerance
• HOTT or HotT - (i) Hordes of the Things (miniature fantasy wargaming rules; a play on Lord of the Rings)
• HOV - (i) High Occupancy Vehicle

HP

• hp - (s) horse power
• HP - (i) Hewlett-Packard
• HPA - (i) U.K. Health Protection Agency
• HPGL or HP-GL - (i) Hewlett-Packard Graphics Language
• HP-IB - (i) Hewlett-Packard Instrument/Interface Bus (first implementation of GP-IB, later standardised and now known as IEEE-488)
• HP-IL - (i) Hewlett-Packard Interface Loop (serial bus used with some HP calculators and computers, notably the HP-41 and HP-71 series)
• HPT - (i) High^* Payoff Target
• HPV - (i) Human papilloma virus

HQ

• HQ - (i) HeadQuarters - (s) Howland Island (FIPS 10-4 territory code)
• HQDA - (i) HeadQuarters, Department of the Army

HR

• HR - (s) Croatia (FIPS 10-4 country code; ISO 3166 digram) - (i) Harvard Revised star catalogue - Human Resources
• HRBL - (i) High-level Representation of Behavior Language (original name of the Herbal language)
• HRED - (i) (U.S. Army Research Laboratory's) Human Research and Engineering Directorate (Aberdeen Proving Ground, MD)
• HRF - (i) High Readiness Forces
• HRH - (i) His (or Her) Royal Highness
• HRV - (s) Croatia (ISO 3166 trigram) - (i) High Resolution Visible

HS

• Hs - (s) Hassium
• HSBC - (i) Hongkong and Shanghai Banking Corporation
• HSC - (i) High School Certificate (as used in New South Wales)
• HSMAD - (i) Human Science/Modeling and Analysis Data
• HSPH - (i) Harvard School of Public Health
• HSS - (i) Health Service Support - (i) High-Speed Steel
• HSSI - (i) High-Speed Serial Interface
• HST - see entry
• HSV - (i) Herpes Simplex Virus - Hue Saturation Value (colour model)

HT

• HT - (s) Haiti (ISO 3166 digram) - (i) High Temperature - hoc tempore (Latin, "at this time") - hoc titulo (Latin, "under this title")
• HTI - (s) Haiti (ISO 3166 trigram)
• HTML - (i) HyperText Markup Language
• HTS - (i) High-Temperature Superconducting wire
• HTTP - (i) HyperText Transfer Protocol

HU

• HU - (s) Hungary (ISO 3166 digram; FIPS 10-4 country code)
• HUD - (i/a) Head-Up Display - Housing and Urban Development
• HUMINT - (p) Human Intelligence (military parlance)
• Hum-Vee - (p) Mobility Multipurpose Wheeled Vehicle (HMMWV -> Hum-Vee)
• HUN - (s) Hungary (ISO 3166 trigram)
• HURD - (a) Hird of Unix-Replacing Daemons (cf. Hird)

HV

• HV - (s) Upper Volta (ISO 3166 digram; obsolete 1984)
• HVM - (i) High Velocity Missile
• HVO - (s) Upper Volta (ISO 3166 trigram; obsolete 1984)
• HVP - (i) HarborView Properties - High Vacuum Process - Hydrolized Vegetable Protein

HW

• HW - (p) hardware - (i) High Water (nautical charts)

HX

HY

HZ

• Hz - (s) Hertz
• HZ - (s) Haze (METAR Code)

See also

• List of acronyms and initialisms

Lists of abbreviations | Acronyms