An electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.
A binary map in a given group G, given by [g, h] = ghg⁻¹h⁻¹, where g and h are elements of G, which yields the group's identity if and only if the group operation commutes for g and h.
A binary map in a given ring R, given by [a, b] = ab − ba, where a and b are elements of R, which yields the ring's zero element if and only if the multiplication operation commutes for a and b.
A toggle switch.
A fastener that has flaps that align vertically to penetrate a surface and then spread out to secure the fastener in position, e.g. a molly bolt.
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.
A rod-shaped button bound with slack to the fabric.
A horizontal piece of wood that is placed on a door, flat, or other wooden structure, but is not on one of the edges of the structure.
An appliance for transmitting force at right angles to its direction.
A loop of webbing or a dowel affixed to the end of the steering/brake lines of a parachute providing the pilot with a means of control.
To fix like a toggle iron; to fix fast.
To alternate between two positions using a single switch or lever.
To switch between alternate states.