HD may refer to:

Business

* H-D or Harley-Davidson, a motorcycle manufacturer *

The Home Depot The Home Depot, Inc., often referred to as Home Depot, is an American multinational corporation, multinational home improvement retail corporation that sells tools, construction products, appliances, and services, including fuel and transportat ...

, NYSE stock symbol: HD

Chemistry

Hydrogen deuteride Hydrogen deuteride is an isotopologue of dihydrogen composed of two isotopes of hydrogen: the majority isotope 1H ( protium) and 2H (deuterium Deuterium (hydrogen-2, symbol H or D, also known as heavy hydrogen) is one of two stable isotopes ...

, a diatomic compound of hydrogen and deuterium *

Mustard gas Mustard gas or sulfur mustard are names commonly used for the organosulfur compound, organosulfur chemical compound bis(2-chloroethyl) sulfide, which has the chemical structure S(CH2CH2Cl)2, as well as other Chemical species, species. In the wi ...

Codes

Air Do , previously known as , is a Japanese regional airline headquartered in Sapporo, Sapporo, Japan. It operates scheduled service between the islands of Honshu and Hokkaido in cooperation with All Nippon Airways, from its hubs at New Chitose Airpor ...

, formerly Hokkaido International Airlines, IATA designator * HD postcode area, covering Huddersfield, Brighouse and Holmfirth in England, UK *

Heidelberg Heidelberg (; ; ) is the List of cities in Baden-Württemberg by population, fifth-largest city in the States of Germany, German state of Baden-Württemberg, and with a population of about 163,000, of which roughly a quarter consists of studen ...

's vehicle registration plate code *

Hunedoara County Hunedoara County () is a county (''județ'') of Romania, in Transylvania, with its capital city at Deva, Romania, Deva. The county is part of the Danube–Criș–Mureș–Tisa Euroregion. Name In Hungarian language, Hungarian, it is known as , ...

(Romania)'s ISO 3166 code

Medicine

Hansen's disease Monster Beverage Corporation is an American beverage company that manufactures energy drinks including Monster Energy, Relentless (drink), Relentless, Reign (drink), Reign and Burn (energy drink), Burn. The company was originally founded as Ha ...

or leprosy *

Hirschsprung's disease Hirschsprung's disease (HD or HSCR) is a birth defect in which nerves are missing from parts of the intestine. The most prominent symptom is constipation. Other symptoms may include vomiting, abdominal pain, diarrhea and slow growth. Most child ...

, a disorder of the abdomen *

Huntington's disease Huntington's disease (HD), also known as Huntington's chorea, is an incurable neurodegenerative disease that is mostly Genetic disorder#Autosomal dominant, inherited. It typically presents as a triad of progressive psychiatric, cognitive, and ...

, a genetic disorder affecting the central nervous system ** HD (gene) or huntingtin, the IT15 gene, which codes for the huntingtin protein

People

* H.D. or Hilda Doolittle (1886–1961), American poet and novelist

Other uses

* ''

Helsingborgs Dagblad (''HD'', lit. "Helsingborg's Daily Paper"), published in Helsingborg in Skåne is the largest (circ. 84,000) newspaper in Swedish outside the metropolitan cities of Malmö, Gothenburg and Stockholm. History and profile The newspaper was found ...

'', a Swedish newspaper *

Henry Draper Catalogue The ''Henry Draper Catalogue'' (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the ''Henry Draper Extension'' (HDE), published between 192 ...

, an astronomical catalogue often used to designate stars * Department of Highways (disambiguation) * ''Högsta Domstolen'', the Supreme Court of Sweden * Hurter and Driffield Numbers or H&D, an old scale for measuring film speed

Technology

Hard drive A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating hard disk drive platter, pla ...

, an electro-mechanical data storage device * ''Hash digest'', the output of a

hash function A hash function is any Function (mathematics), function that can be used to map data (computing), data of arbitrary size to fixed-size values, though there are some hash functions that support variable-length output. The values returned by a ...

HD Photo JPEG XR (JPEG extended range) is an image compression standard for continuous tone photographic images, based on the HD Photo (formerly Windows Media Photo) specifications that Microsoft originally developed and patented. It supports both lossy ...

, an image format *

HD Radio HD Radio (HDR) is a trademark for in-band on-channel (IBOC) digital radio broadcast technology. HD radio generally simulcast, simulcasts an existing analog radio station in digital format with less noise and with additional text information. HD R ...

, an abbreviation from the term hybrid digital/analog radio *

HD Voice Wideband audio, also known as wideband voice or HD voice, is high definition voice quality for telephony audio, contrasted with standard digital telephony "toll quality". It extends the frequency range of audio signals transmitted over telephone ...

, or wideband audio *

Heavy Duty (disambiguation) Heavy Duty may refer to: Characters * Heavy Duty (G.I. Joe), a fictional character in the G.I. Joe universe * Heavy Duty or Heavy Load (Transformers), a character in the fictional ''Transformers'' universe Other uses * Heavy duty truck, a ...

High density High may refer to: Science and technology * Height * High (atmospheric), a high-pressure area * High (computability), a quality of a Turing degree, in computability theory * High (tectonics), in geology an area where relative tectonic uplift t ...

, a diskette density *

High-definition television High-definition television (HDTV) describes a television or video system which provides a substantially higher image resolution than the previous generation of technologies. The term has been used since at least 1933; in more recent times, it ref ...

(HDTV), a resolution that is substantially higher than that of standard-definition television **

720p 720p (720 lines progressive) is a progressive HD signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9, normally known as widescreen HD (1.78:1). All major HD broadcasting standards (such as SMPTE 292M) includ ...

(HD), a progressive HDTV signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9 **

1080p 1080p (1920 × 1080 progressively displayed pixels; also known as Full HD or FHD, and BT.709) is a set of HDTV high-definition video modes characterized by 1,920 pixels displayed across the screen horizontally and 1,080 pixels down the sc ...

(Full HD), or

1080i In high-definition television (HDTV) and video display technology, 1080i is a video display format with 1080 lines of vertical resolution and Interlaced video, interlaced scanning method. This format was once a standard in HDTV. It was particular ...

4K HD 4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 38402160 ( 4K UHD) with a 16:9 a ...

(Ultra HD), or

8K UHD Ultra-high-definition television (also known as Ultra HD television, Ultra HD, UHDTV, UHD and Super Hi-Vision) today includes 4K UHD and 8K UHD, which are two digital video formats with an aspect ratio of 16:9. These were first proposed by ...

High-definition video High-definition video (HD video) is video of higher resolution and quality than standard-definition. While there is no standardized meaning for ''high-definition'', generally any video image with considerably more than 480 vertical scan lines ( ...

, video of higher resolution and quality than standard-definition *

Intel High Definition Audio Intel High Definition Audio (IHDA) (also called HD Audio or development codename Azalia) is a specification for the audio sub-system of personal computers. It was released by Intel in 2004 as the successor to their AC'97 PC audio standard, but it ...

, a specification for the audio sub-system of personal computers