A wooden or metal pin, short rod, crosspiece or similar, fixed transversely in the eye of a rope or chain to be secured to any other loop, ring, or bight, e.g. a sea painter to a lifeboat.
User Defined Definitions
"any instruction that works first one way and then the other; it turns something on the first time it is used and then turns it off the next time"
"a hinged switch that can assume either of two positions"