DD, dd, or other variants may refer to:

Arts and entertainment

*"D.D.", a track on mixtape '' Echoes of Silence'' by The Weeknd *

DD (character) The following is a list of characters featured in ''The Saga of Seven Suns'', a series of science fiction novels written by Kevin J. Anderson from 2002 to 2008. For characters in the sequel trilogy '' The Saga of Shadows'', see List of ''The Saga ...

, a character in ''The Saga of Seven Suns'' novels by Kevin J. Anderson * DD National or DD1, an Indian national television channel * Dancing Dolls, a Japanese all-female pop group * Daredevil (Marvel Comics character), a Marvel Comics character ** Matt Murdock (Marvel Cinematic Universe), the Marvel Cinematic Universe counterpart * Decorative Designers *

Donegal Daily Donegal Daily is a news website based in County Donegal, north-west Ireland. The sports editor is Chris McNulty, who also edits the related Donegal Sport Hub website. Other websites have cited Donegal Daily as a source, as have several newspape ...

, an Irish news website *

Doordarshan Doordarshan (abbreviated as DD; Hindi: , ) is an Indian public service broadcaster founded by the Government of India, owned by the Ministry of Information and Broadcasting and one of Prasar Bharati's two divisions. One of India's largest bro ...

, a public service broadcaster in India * Erann DD, a Danish singer and songwriter *DD, the production code for the 1966 ''Doctor Who'' serial '' The Tenth Planet''

Business

DuPont DuPont de Nemours, Inc., commonly shortened to DuPont, is an American multinational chemical company first formed in 1802 by French-American chemist and industrialist Éleuthère Irénée du Pont de Nemours. The company played a major role in ...

, which trades shares on the New York Stock Exchange as DD *

Dunkin' Donuts Dunkin' Donuts LLC, also known as Dunkin' and by the initials DD, is an American multinational coffee and doughnut company, as well as a quick service restaurant. It was founded by Bill Rosenberg (1916–2002) in Quincy, Massachusetts, in 195 ...

, a company

Military

* DD tank, an amphibious tank * Dishonorable discharge, a punitive discharge in the U.S. military * DD, the U.S. Navy hull classification for

destroyer In naval terminology, a destroyer is a fast, manoeuvrable, long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against powerful short range attackers. They were originally developed in ...

s * DD Form 214, a form used by the U.S. Defense Department

Places

* DD postcode area, in Scotland *

.dd .dd was the assigned country code top-level domain (ccTLD) for the German Democratic Republic (East Germany). It was chosen based on the ISO 3166-1 alpha-2 code for the German Democratic Republic, the letters coming from the German name of the coun ...

, a hypothetical domain name for the German Democratic Republic * Dresden, Germany (license plate code DD)

Science and technology

Computing

* , an

HTML element An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). The first used version of HTML was written by Tim Berners-Lee in 1993 ...

for specifying definition data * dd (Unix), a program that copies and converts files and data * Deckadance, a DJ program for Windows and Mac OS X designed by Image-Line * Deployment descriptor, a component in Java Platform, Enterprise Edition applications * Logo for

Dolby Digital Dolby Digital, originally synonymous with Dolby AC-3, is the name for what has now become a family of audio compression technologies developed by Dolby Laboratories. Formerly named Dolby Stereo Digital until 1995, the audio compression is lossy ...

, audio compression technologies developed by Dolby Laboratories * Double density, a capacity designation on magnetic storage, usually floppy disks * Debian Developer, the traditional full-membership role in

Debian Debian (), also known as Debian GNU/Linux, is a Linux distribution composed of free and open-source software, developed by the community-supported Debian Project, which was established by Ian Murdock on August 16, 1993. The first version of D ...

Other uses in science and technology

Data Deficient A data deficient (DD) species is one which has been categorized by the International Union for Conservation of Nature (IUCN) as offering insufficient information for a proper assessment of conservation status to be made. This does not necessaril ...

, a rating on the IUCN Red List of Threatened Species * Decimal degrees, geographic coordinates shown using decimal fractions * Death domain, a protein-interaction module, a subclass of the death fold protein motif * DD Index, for ''Democracy-Dictatorship Index'' * Abbreviation for dolichospondylic dysplasia, a genetic syndrome * Developmental disability, or developmentally disabled, a diverse group of chronic conditions due to mental or physical impairments arising before adulthood * Deuterium-deuterium fusion, a type of nuclear fusion

Sports

* Delhi Daredevils, former name of Delhi Capitals * Delhi Dynamos FC, an Indian Super League franchise, now Odisha FC

Transportation

* DD tank, an amphibious tank *

D-D locomotive The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. Essentially a simplification of the European UIC classification, it is widely used in ...

, the AAR classification for a railway locomotive with two four-axle bogies *

Danish Air Lines Det Danske Luftfartselskab A/S or DDL, trading in English as Danish Air Lines, was Denmark's national airline from 1918 until it merged to create Scandinavian Airlines System (SAS) in 1951. DDL was established on 29 October 1918, but started it ...

, an airline *

Invincible D-D The Invincible D-D was a prototype three/four seat touring aircraft, built in the US in 1929. One example flew but development was ended by the Great Depression. Design and development The D-D was a mid-wing monoplane with a rectangular plan, b ...

, a prototype aircraft * Nok Air, a low-cost airline based in Thailand * Victorian Railways Dd class, a class of steam locomotives in Australia

Other uses

* DD, a

brassiere measurement Bra size (also known as brassiere measurement or bust size) indicates the size characteristics of a bra. While there are a number of bra sizing systems in use around the world, the bra sizes usually consist of a number, indicating the size of the ...

Dd (digraph) This is a list of digraphs used in various Latin alphabets. Capitalisation involves only the first letter (''ch'' becomes ''Ch'') unless otherwise stated (''ij'' becomes ''IJ''). Letters with diacritics are arranged in alphabetic order accordi ...

, in the Welsh language * Degree of difficulty, in several sports * Demand draft, a negotiable instrument issued by the bank *

Deputy Director (disambiguation) Deputy Director is a job title used in many organizations around the world for a deputy for a director, and may refer to: * Deputy Director, a general rank below director within His Majesty's Civil Service; see Grading schemes * Deputy Director of ...

, a rank in some organizations * Designated driver, a person who remains sober as the responsible driver *

Doctor of Divinity A Doctor of Divinity (D.D. or DDiv; la, Doctor Divinitatis) is the holder of an advanced academic degree in divinity. In the United Kingdom, it is considered an advanced doctoral degree. At the University of Oxford, doctors of divinity are ran ...

, an academic degree * Dine and dash, a form of theft by fraud * Direct debit, a way of paying bills