DD

DD, dd, or other variants may refer to:

Business

• DuPont's stock ticker symbol
• Dunkin' Donuts, a company
• Due diligence, review of documents before closing a business deal

Computing

• .dd, a hypothetical domain name for the German Democratic Republic
• <dd></dd>, an HTML element 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, audio compression technologies developed by Dolby Laboratories
• Double density, a capacity designation on magnetic storage, usually floppy disks

Entertainment

• DD National or DD1, an Indian national television channel
• Doordarshan, a public service broadcaster in India
• Dancing Dolls, a Japanese all-female pop group

Fiction

• DD, a character in The Saga of Seven Suns novels by Kevin J. Anderson
• Daredevil, a Marvel Comics character
• Di-Gata Defenders, a group of heroes in a series of the same name
• Phoenix Wright: Ace Attorney - Dual Destinies, a video game

Military

• DD tank, an amphibious tank
• Dishonorable discharge, a punitive discharge in the U.S. military
• DD, the U.S. Navy hull classification for destroyers
• DD Form 214, a form used by the US Defense Department

Science and technology

• DD in hexadecimal = 221
• Data Deficient, 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

Sports

• Delhi Daredevils, an Indian Premier League franchise
• Delhi Dynamos FC, an Indian Super League franchise

Transportation

• D-D locomotive, the AAR classification for a railway locomotive with two four-axle bogies
• Victorian Railways Dd class, a class of steam locomotives in Australia
• Nok Air's IATA code
• DD, the licence plate code for Dresden, Germany

Other uses

• DD, a brassiere measurement
• Dd (digraph), a digraph in the Welsh language
• Degree of Difficulty, a diving score modifier
• Deputy Director (disambiguation), a rank in some organizations
• Designated driver, a person who remains sober as the responsible driver
• Doctor of Divinity, an academic degree
• DD postcode area in Scotland
• Delhi Daredevils, an Indian cricket franchisee
• Destructive device, in the United States, a type of firearm or explosive device regulated by the National Firearms Act of 1934

See also

• Dede (disambiguation)
• Dedee (disambiguation)
• Deede (disambiguation)
• Deedee (disambiguation)
• Didi (disambiguation)