I/O jack

An I/O jack was a type of interface jack by which some droids, such as an R2-series astromech droid, can control a computer.

History
This type of jack was included on the cockpit computer of the Millennium Falcon. In 3 ABY, R2-D2 used this I/O jack during a conversation with C-3PO about the requisite skills to pilot starships.