DD

DD, dd, or other variants may refer to:

Computing

• dd (Unix), a program that copies and convert files and data
• dd, an HTML element for specifying definition data
• Dolby Digital, the name for audio compression technologies developed by Dolby Laboratories
• Deployment Descriptor, a component in Java Platform, Enterprise Edition applications
• Double density, a capacity designation on magnetic storage, usually floppy disks
• Deckadance, a DJ program for Windows and Mac OS X designed by Image-Line
• .dd, a hypothetical domain name for the German Democratic Republic.

Military

• DD tank, an amphibious swimming tank
• Dishonorable discharge, a punitive discharge in the US Military
• Destroyer, a US Navy hull classification

Companies

• Dunkin' Donuts, a coffee and baked goods franchise
• DuPont (stock ticker symbol), an American chemical company
• Nok Air (IATA code), airline from Bangkok, Thailand

Other

• D-D locomotive, the UIC classification for a railway locomotive with two four-axle bogies
• DD, the licence plate code for Dresden, Germany
• DD brassiere measurement
• DD Deficit Disorder, Attention, Social, Emotional, Nature, etc.…
• Dd (digraph), in the Welsh language
• DD National, an Indian national channel also referred as DD1
• Data Deficient, on the IUCN Red List of Threatened Species
• Decimal degrees, geographic coordinates shown using decimal fractions
• Delhi Daredevils, an Indian Premier League cricket franchise
• Designated driver, an individual within a group of people drinking alcoholic beverages who remains sober to drive others home
• Doctor of Divinity (D.D.), as the abbreviation for the Latin term Divinitatis Doctor
• Due diligence, a legal term
• Destructive Device, a class of firearms and explosive devices in United States law.
• Dangerous Drug, a nursing term for opiates and other medications of addiction kept under lock and key.