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From WordNet (r) 2.0 [wn]:
DD
noun: a doctor's degree in religion [syn: {Doctor of Divinity}]
From Jargon File (4.3.1, 29 Jun 2001) [jargon]:
dd /dee-dee/ vt. [Unix: from IBM {JCL}] Equivalent to {cat} or {BLT}. Originally the name of a Unix copy command with special options suitable for block-oriented devices; it was often used in heavy-handed system maintenance, as in "Let's 'dd' the root partition onto a tape, then use the boot PROM to load it back on to a new disk". The Unix 'dd(1)' was designed with a weird, distinctly non-Unixy keyword option syntax reminiscent of IBM System/360 JCL (which had an elaborate DD 'Dataset Definition' specification for I/O devices); though the command filled a need, the interface design was clearly a prank. The jargon usage is now very rare outside Unix sites and now nearly obsolete even there, as 'dd(1)' has been {deprecated} for a long time (though it has no exact replacement). The term has been displaced by {BLT} or simple English 'copy'.
From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:
DD
1. {double density}. 2. {Data Dictionary}. [{Jargon File}] (1998-08-28)
From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:
dd A {Unix} copy command with special options suitable for block-oriented devices; it was often used in heavy-handed system maintenance, as in "Let's "dd" the {root partition} onto a tape, then use the {boot PROM} to load it back on to a new disk". The Unix "dd" was designed with a weird, distinctly non-Unixy keyword option syntax reminiscent of {IBM} {System/360} JCL (which had an elaborate DD "Dataset Definition" specification for I/O devices); though the command filled a need, the interface design was clearly a prank. The jargon usage is now very rare outside Unix sites and now nearly obsolete even there, as "dd" has been {deprecated} for a long time (though it has no exact replacement). The term has been displaced by {BLT} or simple English "copy". [{Jargon File}] (1995-02-03)
From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:
DD Dansk Dataforening (org., Denmark)
From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:
DD Data Dictionary (SA, CASE, DB)
From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:
DD Depacketization Delay
From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:
DD Double Density [disks] (FDD)
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