The part of the pin-tumbler cylinder mechanism into which the key enters and which the key turns. It houses the pins of a pin tumbler cylinder mechanism.

an electrical device with two or three pins that is inserted in a socket to make an electrical connection

terminal in an electrical installation through which electrical and electronic devices are connected to the grid.

The round part containing the keyway and rotated by the key to transmit motion to the bolt(s).

Also called an "attachment plug," it is the cable mount portion of an electrical connection or male contact device that has pins or blades protruding from the face.

n. the part of a cylinder which contains the keyway, with tumbler chambers usually corresponding to those in the cylinder shell