A DIN connector is a small, approx. 1/2" round connector, which is used in many
electronic and electrical appliances.
DIN,
(Deutsches Institut für Normung
connector; German
Standards Institute connector) - a family of plugs and
sockets used to connect a variety of devices.
Earlier PC keyboards use a five-pin DIN. The PS/2 connector uses a smaller 6-pin Mini-DIN.