Gosh... whodathunk there were so many (with thanks to
Acronym Finder)
Double Data Rate (RAM)
Deutsche Demokratische Republik (former East Germany)
Dance Dance Revolution (dance simulation game series)
Dance Dance Revolution (band)
Dial-on-Demand Routing
Disarmament, Demobilization and Reintegration
Data Direction Register
Drug Demand Reduction
Radar Picket Destroyer (US Navy ship type)
Digital Disk Recorder
Digital Data Recorder
Dynamic Document Review (Symantec web security feature)
Discovery Data Record (Microsoft System Management Server)
Detailed Design Review
Dynamic Device Recognition (HP Tru64 Unix)