A "subpoena duces tecum." directs an individual to come to court and directs that certain items be brought with them. A 'regular' subpoena simply directs the individual to come to court.
Subpoena duces tecum is translated as, "Under penalty, produce (or, bring with)" the requested documents or other physical evidence. This request can be used for either depositions or court...
subpena duces tecum : (suh-pea-nah dooh-chess-take-uhm or dooh-kess-take-uhm): a court order requiring a witness to bring documents in the possession or under the control of the witness to a certain...