Editing HD

{{for|Wikipedia's help desk|Wikipedia:Help Desk|selfref=y}}
{{wiktionary|H.D.|HD|hd.}}
'''HD''' may refer to:

{{TOC right}}

== 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)]]
* [[Supreme Court of Sweden|''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 ==
* {{lookfrom|HD}}
* {{intitle|HD}}

{{disambiguation}}