dead code = D = dead-tree version
dead link n.
[very common] A World-Wide-Web URL that no longer points to the information it was written to reach. Usually
this happens because the document has been moved or deleted. Lots of dead links make a WWW page frustrating and useless
and are the #1 sign of poor page maintainance. Compare dangling pointer, link rot.
--The Jargon File version 4.3.1, ed. ESR, this entry manually entered by rootbeer277.