DD
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DD may stand for:
- A brassiere size
- Defeating Deafness
- Designated Driver, a person who does not drink at a party and drives others home safely
- Digital Drivel (http://www.digitaldrivel.com), a highly successful message board
- Divinitatis Doctor, Latin for Doctor of Divinity (theology)
- Dolby Digital, the trademark for an audio compression system created by Dolby Laboratories
- Dominic Deegan (http://www.dominic-deegan.com), a webcomic
- Double Density, a floppy disk storage density
- East Germany (ISO 3166 digram; obsolete since 1990)
- A hull classification symbol for US Navy destroyers
- The NYSE ticker symbol for DuPont
- Dee-Dee a.k.a. Depression
- Duran Duran, a famous British pop/rock group.
- Don't Die, common internet slang used in computer games.
dd may stand for:
- A Unix program to copy and convert files
- An HTML and XHTML element for specifying definition data (
dd) - The former Internet top-level domain (".dd") for the German Democratic Republic (East Germany)