A toggle switch.

A feature or key that is turned on and off with the same keystroke.

To switch between alternate states. For example, between on and off, or caps and lower case.

To switch an option to one of two positions (either on or off). The "caps lock", "scroll lock", and "num lock" keys are examples of toggle switches.

A wooden pin tapering toward both ends with a groove around its middle, fixed transversely in the eye of a rope to be secured to any other loop or bight or ring; a kind of button or frog capable of being readily engaged and disengaged for temporary purposes.

A pin placed through the bight or eye of a rope, block-strap, or bolt, to keep it in its place, or to put the bight or eye of another rope upon, and thus to secure them both together.

A peg, usually of wood or plastic, fastened to a rope sown into the HEADING of the flag. To raise the flag, the toggle is fit into a loop in the HALYARD. In Canada, the rope and toggle are very common means of fastening a flag to the halyard.

a fastener consisting of a peg or pin or crosspiece that is inserted into an eye at the end of a rope or a chain or a cable in order to fasten it to something (as another rope or chain or cable)