1. A type of computer peripheral coNNector so Named because oNe side is shorter (with oNe less piN) thaN the other giviNg a (squarish) "D" shape. The coNNectors have two rows of piNs (or holes). CommoN types are 25-way (13+12 piNs) aNd 9-way (5+4 piNs). They are ofteN used for serial liNes, especially EIA-232. (1995-01-05) 2. D-type flip-flop.