DD, dd, or other variants may refer to:
Double data rate type three SDRAM (DDR3 SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) with a high bandwidth ("double data rate") interface, and has been in use since 2007. It is the higher-speed successor to DDR and DDR2 and predecessor to DDR4 synchronous dynamic random-access memory (SDRAM) chips.
In computing, DDR4 SDRAM, an abbreviation for double data rate fourth-generation synchronous dynamic random-access memory, is a type of synchronous dynamic random-access memory (SDRAM) with a high bandwidth ("double data rate") interface.
dd is a command-line utility for Unix and Unix-like operating systems whose primary purpose is to convert and copy files.
In professional wrestling a DDT is any move in which the wrestler has the opponent in a front facelock/inverted headlock, and falls down or backwards to drive the opponent's head into the mat.
DDD or Triple D may refer to:
DD or Duplex Drive tanks, nicknamed "Donald Duck tanks", were a type of amphibious swimming tank developed by the British during the Second World War.
DDR2 SDRAM is a double data rate synchronous dynamic random-access memory interface. It superseded the original DDR SDRAM specification, and is superseded by DDR3 SDRAM (launched in 2007).
DDB Worldwide Communications Group Inc., known internationally as DDB, is a worldwide marketing communications network.