DD
- DD – many, including due diligence and dear daughter (increasingly prevalent on social mailing lists, blogs, and bulletin boards); see entry
- D&D – (i) Dungeons and Dragons – Diversion and Distress (Air Traffic Control)
- DDA – (i) Digital Differential Analyzer (graphics algorithm) – Digital Differential Analyzer – Deputy District Attorney
- DDD – (i) Data Display Debugger – Digital Digital Digital (CD mastering)
- DDL – (i) Digital Data Link
- DDN – (i) U.S. Defense Data Network
- DDoS – (i) Distributed Denial of Service
- DDR – (i) Dance Dance Revolution – Deutsche Demokratische Republik (German, "German Democratic Republic" (GDR), East Germany) – Double Data Rate – (s) East Germany (ISO 3166 trigram, obsolete since 1990)
- DDR&E – (i) (U.S.) Defense Department Research and Engineering
- DDS – (i) Doctor of Dental Surgery
- DDT – (i) Dichloro-Diphenyl-Trichloroethane (insecticide) – Dynamic Debugging Tool (computing)
Read more about this topic: List Of Acronyms And Initialisms: D