HD

For Wikipedia's help desk, see Wikipedia:Help Desk.

HD may refer to:

Business

• 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

• All pages with titles beginning with HD
• All pages with titles containing HD