(Main list of acronyms)

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

HA

  • ha – (s) Hausa language (ISO 639-1 code) – Hectare
  • HA – (s) Haiti (FIPS 10-4 country code) – (i) High Availability
  • HAC - (a) Home Access Center
  • HAARP – (a) High Frequency Active Auroral Research Program
  • HAART – (a) Highly Active Anti-Retroviral Therapy
  • HAI – (i) Human Awareness Institute
  • HAL – (i) Hardware Abstraction Layer
  • HALO –
  • (a) Habitation and Logistics Outpost (of the planned Lunar Gateway space station)
  • High Altitude Low Opening (parachute jump)
  • HALT
  • (a) Highly Accelerated Life Test
  • (a) Hungry Angry Lonely Tired
  • HAMR – (a) Heat-assisted magnetic recording
  • HAN - (s) IATA code for Noi Bai International Airport
  • HANS – (a) Head And Neck Support (device used in many race cars)
  • HARM – (a) High-speed Anti-Radiation Missile
  • hat – (s) Haitian Creole language (ISO 639-2 code)
  • HAT – (i/a) Highest Astronomical Tide (nautical charts) – (a) Hungarian Automated Telescope
  • hau – (s) Hausa language (ISO 639-2 code)
  • 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

  • HBCD – (p) HexaBromoCycloDodecane
  • HBCI – (i) Home Banking Computer Interface
  • HBCU – (i) Historically black colleges and universities (U.S.)
  • HBO – (i) Home Box Office
  • HBR – (i) Harvard Business Review
  • HBT – (i) Heterojunction Bipolar Transistor
  • HBV – (i) Hepatitis B Virus

HC

  • h.c. – (i) honoris causa (Latin, "for the sake of honor")
  • HCAL — (p) Homogeneous calorimeter
  • HCCI – (i) Homogeneous Charge Compression Ignition
  • HCF – (i) Highest Common Factor
  • HCI – (i) Human–Computer Interaction/Interface
  • HCPCS – (i) Health Care Procedure Coding System
  • 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 (armored vehicle target, as opposed to Fully Exposed)
  • High Definition
  • Huntington's Disease
  • HDD
  • (i) Hard Disk Drive
  • High-Density Disk
  • HDL – (i) High-Density Lipoprotein
  • HDM – (i) Human Decision-Making
  • HDMI – High-Definition Multimedia Interface
  • HDR
  • (i) Hard disk recorder
  • Henningson, Durham & Richardson (founders of the engineering and construction firm now known by their initials)
  • High dynamic range, a term used in both digital imaging and 3D rendering
  • Hot Dry Rock (experimental geothermal technology)
  • Human Development Report (UN publication)
  • HDRA – (i) Henry Doubleday Research Association
  • HDTV – (p) High-definition television

HE

  • he – (s) Hebrew language (ISO 639-1 code)
  • He – (s) Helium
  • HE – (a) High Explosive
  • HEAT – (a) High-Explosive Anti-Tank (ammunition)
  • heb – (s) Hebrew language (ISO 639-2 code)
  • HEBA – (p) Hellenic Basketball Clubs Association
  • HEER – (a) High-Explosive Extended Range (ammunition)
  • HEIC – (i) Honourable East India Company
  • HELOC – (a) Home equity line of credit
  • HEMP – (a) High-Altitude Electromagnetic Pulse
  • HEO
  • (a) High Earth orbit
  • (a) Highly elliptical orbit
  • HEOSS – (a) High Earth Orbit Space Surveillance
  • HEP – (i) High-Explosive Plastic (ammunition)
  • HEPA – (a/i) High-Efficiency Particulate Air (filter)
  • her – (s) Herero language (ISO 639-2 code)
  • HESH – (a) High-Explosive, Squash-Head (ammunition)
  • HESV – (i) Heavy Engineering Support Vehicle
  • HETT – (a) Heavy Equipment Transporting Truck / Heavy Equipment Truck Tractor
  • HEU – (i) Highly Enriched Uranium
  • HEV
  • Hybrid Electric Vehicle (non-rechargeable)
  • Hazadous EnVironment suit - outfit worn by Half-Life protagonist Gordon Freeman
  • Hewitts – (a) Hills in England, Wales and Ireland over Two Thousand feet (with topographic prominence of at least 30 m)

HF

  • Hf – (s) Hafnium
  • HF – (i) High Frequency
  • HFAC – (p) Human Factors ("aytchfak")
  • HFE – (i) Human Fertilisation and Embryology (UK Act)
  • HFE – (s) The common-emitter current gain in a BJT transistor (also represented by βF). See: BJT
  • HFEA – (i) Human Fertilisation and Embryology Authority (UK)

HG

  • Hg – (i) Mercury (Latin Hydrargyrum)
  • HGC – (i) UK Human Genetics Commission
  • HGF – (i) Human Growth Factor
  • HGTV – (i) Home & Garden Television

HH

  • HHD – (p) humanitatum doctor (Latin, "doctor of humanities")
  • HHB – Ha Ha Bonk – The noise made when you laugh your head off. Used instead of LOL...
  • HHS – (i) (U.S. Department of) Health and Human Services

HI

  • hi – (s) Hindi language (ISO 639-1 code)
  • HI – (s) Hawaii (postal symbol)
  • HIC – Hierarchical Ingredient Code, a system of classifying drug ingredients [http://reference.pivotrock.net/HealthCareTraining/Drugs/RXC.html]
  • HIDACZ – (p) High-Density Airspace Control Zone ("high dak zed/zee")
  • HIH – (i) His (or Her) Imperial Highness
  • HIIT - (a) High-Intensity Interval Training
  • HIM – (i) His (or Her) Imperial Majesty
  • HIMAD – (p) High to Medium Altitude Air Defence (see also H/MAD)
  • HIMARS - (a) HIgh Mobility Artillery Rocket System
  • HIMEZ – (a) High Altitude Missile Engagement Zone
  • HIMYM – How I Met Your Mother
  • hin – (s) Hindi language (ISO 639-2 code)
  • HIPAA – (i) U.S. Health Insurance Portability and Accountability Act
  • Hipparcos – (p) HIgh Precision Parallax COllecting Satellite
  • Hird – (a) Hurd of interfaces representing depth (cf. HURD)
  • HiRISE – (p) High Resolution Imaging Science Experiment
  • HIT – (a) Health Information 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)
  • HKD – (s) Hong Kong dollar (ISO 4217 currency code)
  • HKG –
  • (s) Hong Kong (ISO 3166 trigram)
  • Hong Kong International Airport (IATA code)
  • HKMAO – (i) Hong Kong and Macau Affairs Office
  • HKO – (i) Hong Kong Observatory
  • HKS – (i) HyperKinetic Syndrome
  • HKSAR – (i) Hong Kong Special Administrative Region of the People's Republic of China

HL

  • hL – (s) Hectolitre
  • HL
  • (i) Holding Line
  • (i) Half-Life
  • HLA – (i) High Level Architecture (simulation) – Human Leukocyte Antigen
  • HLL – (i) High-Level Language
  • HLN – (i) Headline News
  • HLOS – (i) High Level Output Specification
  • HLS – (i) hoc loco situs (Latin, "laid in this place")
  • HLVW – (i) Heavy Logistics Vehicle, Wheeled

HM

  • HM
  • (s) Heard Island and McDonald Islands (ISO 3166 digram; FIPS 10-4 territory code)
  • (i) His Majesty / Her Majesty (title for certain monarchs)
  • (i) Hatsune Miku
  • H/MAD – (p) High/Medium Altitude Air Defence ("aytchmad"; see also HIMAD)
  • HMCE – (i) Her/His Majesty's Customs and Excise (former UK government department; succeeded by HM Revenue and Customs)
  • HMCS
  • (i) Her/His Majesty's Canadian Ship
  • Her Majesty's Courts Service (former UK agency; succeeded by Her Majesty's Courts and Tribunals Service)
  • HMD
  • (s) Heard and McDonald Islands (ISO 3166 trigram)
  • (i) Helmet-Mounted Display
  • HMF – (p) HydroxyMethyl Furfural
  • HMICFRS - (i) His/Her Majesty's Inspectorate of Constabularies and of Fire and Rescue Services (UK Government agency)
  • HMM – (i) Hidden Markov model
  • HMMWV – (i) High Mobility Multipurpose Wheeled Vehicle ("hum-vee"; "hummer")
  • hmo – (s) Hiri Motu language (ISO 639-2 code)
  • HMO – (i) Health maintenance organization
  • HMO – (i) House in multiple occupation
  • HMO – (i) Human milk oligosaccharide
  • HMP – (i) Her Majesty's Prison
  • HMRC – (i) Her/His Majesty's Revenue and Customs
  • HMS - (i) Her/His Majesty's Ship (Royal Navy)
  • HMSO – (i) Her Majesty's Stationery Office
  • HMV – (i) His Master's Voice (disambiguation)

HN

  • HN – (s) Honduras (ISO 3166 digram)
  • HND
  • (s) Honduras (ISO 3166 trigram)
  • Tokyo Haneda Airport (IATA code)
  • HNL
  • (s) Honduran lempira (ISO 4217 currency code)
  • Daniel K. Inouye International Airport (IATA code)

HO

  • ho – (s) Hiri Motu language (ISO 639-1 code)
  • Ho – (s) Holmium
  • HO – (s) Honduras (FIPS 10-4 country code)
  • HOLLAND – (a) Hope Our Love Lasts And Never Dies
  • HOMES – the Great Lakes; Huron, Ontario, Michigan, Erie, Superior
  • HONY – Humans of New York, a photoblog.
  • 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
  • HOTAS – (a) Hands on throttle-and-stick
  • HOTT or HotT – (i) Hordes of the Things (miniature fantasy wargaming rules; a play on The Lord of the Rings)
  • HOV – (i) High Occupancy Vehicle

HP

  • hp – (s) horse power
  • HP –
  • (i) Hewlett-Packard
  • Hindustan Petroleum
  • (s) Himachal Pradesh (Indian state code)
  • HPA – (i) UK Health Protection Agency
  • HPCL – (i) Hindustan Petroleum Corporation Limited
  • HPGL or HP-GL – (i) Hewlett-Packard Graphics Language
  • HPH - (s) IATA code for Cat Bi International Airport
  • 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)
  • HPLC – (i) High Performance Liquid Chromatography
  • HPMOR – (i) Harry Potter and the Methods of Rationality (work of Harry Potter fan fiction)
  • HPT – (i) High[er] Payoff Target
  • HPV – (i) Human Papilloma Virus

HQ

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

HR

  • hr – (s) Croatian language (ISO 639-1 code)
  • HR
  • (s) Croatia (FIPS 10-4 country code; ISO 3166 digram – from the country's native name of Hrvatska)
  • (s) Haryana (Indian state code)
  • (i) Harvard Revised star catalogue
  • Human Resources
  • HRBL – (i) High-level Representation of Behavior Language (original name of the Herbal language)
  • HRD – (i) Human Resource Development
  • HRED – (i) (U.S. Army Research Laboratory's) Human Research and Engineering Directorate (Aberdeen Proving Ground, Maryland)
  • HRF – (i) High Readiness Forces
  • HRH – (i) His (or Her) Royal Highness
  • HRK – (s) Croatian kuna (ISO 4217 currency code)
  • HRM – (i) His (or Her) Royal Majesty
  • HRM – (i) Human Resource Management
  • HRT – (i) Hormone Replacement Therapy
  • hrv – (s) Croatian language (ISO 639-2 code)
  • HRV
  • (s) Croatia (ISO 3166 trigram)
  • (i) High Resolution Visible

HS

  • Hs – (s) Hassium
  • HSA – A health savings account available to taxpayers in the United States.
  • HSBC – (i) The Hong Kong and Shanghai Banking Corporation
  • HSC
  • (i) Higher School Certificate
  • (i) Helicopter Sea Combat, a type of U.S Navy aviation squadron
  • HSM – (i) High School Musical
  • HSMAD – (i) Human Science/Modeling and Analysis Data
  • HSN – (i) Home Shopping Network
  • 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) Haitian Creole language (ISO 639-1 code)
  • HT
  • (s) Haiti (ISO 3166 digram)
  • (i) High Temperature
  • hoc tempore (Latin, "at this time")
  • hoc titulo (Latin, "under this title")
  • HTA – (i) HyperText Application
  • HTC
  • High Tech Computer Corporation, original name of the company now known simply as HTC
  • HTFU – (a) Harden The F**k Up
  • HTG – (s) Haitian gourde (ISO 4217 currency code)
  • HTH – (a) Hope That Helps
  • 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) Hungarian language (ISO 639-1 code)
  • HU – (s) Hungary (ISO 3166 digram; FIPS 10-4 country code)
  • HUD – (i/a) Head-Up Display – Housing and Urban Development
  • HUF – (s) Hungarian forint (ISO 4217 currency code)
  • HUHA – (a) Head up his/her ass (Marine salute; probably a backcronym)
  • HUI - (s) IATA code for Hue's Phu Bai International Airport
  • HUMINT – (p) Human Intelligence (military parlance)
  • Hum-Vee – See HMMWV
  • hun – (s) Hungarian language (ISO 639-2 code)
  • HUN – (s) Hungary (ISO 3166 trigram)
  • HURD – (a) Hird of Unix-Replacing Daemons (cf. Hird)
  • HVU – (i) High Value Unit (military)

HV

  • HV – (s) Upper Volta (ISO 3166 digram; obsolete 1984)
  • HVAC – (s) Heating, ventilation and air conditioning Used in architecture, business and marketing; refers to a building's entire system of heating, moving, or cooling air.
  • HVAP – (i) High Velocity Armour Piercing (ammunition)
  • HVHF – (i)High velocity human factors
  • HVI - (i) High Value Individual
  • HVM – (i) High Velocity Missile
  • HVO – (s) Upper Volta (ISO 3166 trigram; obsolete 1984)
  • HVP –
  • (i) HarborView Properties
  • High vacuum process<!--http://www.hvp.it -->
  • Hydrolyzed vegetable protein
  • High Velocity Protection
  • H.V.P. (rapper)
  • High Voltage Protection
  • High Vapor Pressure
  • High-Velocity Projectile
  • High-Video Pass
  • High-Velocity Particle
  • Hub Voice Processor
  • Human Variome Project
  • HVT - (i) High-Value Target (US military terminology)

HW

  • HW – (p) Hardware – (i) High Water (nautical charts)
  • HWM – (i) Hardware morphing (computer graphics rendering)

HX

  • HX –
  • (s) IATA code of Hong Kong Airlines
  • (s) Medical history
  • (s) Hydrogen halide
  • (s) Concept automobile by HUMMER
  • HXB – (s) The glycoprotein Tenascian C

HY

  • hy – (s) Armenian language (ISO 639-1 code)
  • hye – (s) Armenian language (ISO 639-2 code)
  • HYP
  • (i) Halkın Yükselişi Partisi (Turkish: "People's Ascent Party"), a political party in Turkey
  • Harvard, Yale, Princeton (perennially at or near the top of American university rankings)
  • HYS – (i) Harvard, Yale, Stanford (perennially named as the top three law schools in the U.S.)

HZ

  • hz – (s) Herero language (ISO 639-1 code)
  • Hz – (s) Hertz
  • HZ – (s) Haze (METAR Code)