HD

• H-D or Harley-Davidson, a motorcycle manufacturer • The Home Depot, NYSE stock symbol: HD == Chemistry ==

• Hydrogen deuteride, a diatomic compound of hydrogen and deuterium • Mustard gas ==Codes==

• Air Do, formerly Hokkaido International Airlines, IATA designator • HD postcode area, covering Huddersfield, Brighouse and Holmfirth in England, UK • Heidelberg's vehicle registration plate code • Hunedoara County (Romania)'s ISO 3166 code == Medicine ==

• Hansen's disease or leprosy • Hirschsprung's disease, a disorder of the abdomen • Huntington's disease, 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, a Swedish newspaper • Henry Draper Catalogue, 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, an electro-mechanical data storage device • Hash digest, the output of a hash function • HD Photo, an image format • HD Radio, an abbreviation from the term hybrid digital/analog radio • HD Voice, or wideband audio • Heavy Duty (disambiguation) • High density, a diskette density • High-definition television (HDTV), a resolution that is substantially higher than that of standard-definition television • 720p (HD), a progressive HDTV signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9 • 1080p (Full HD), or 1080i • 4K HD (Ultra HD), or 8K UHD • High-definition video, video of higher resolution and quality than standard-definition • Intel High Definition Audio, a specification for the audio sub-system of personal computers == See also ==