instrumentation (a piece of equipment or tool) used to effect an end

a thin tapered rod used by a conductor to lead an orchestra or choir

a hollow metal rod that is wielded or twirled by a drum major or drum majorette

a rod that transmits motion (especially one that connects a rotating wheel to a reciprocating shaft)

a steel or aluminum rod that can be moved up or down to control the rate of the nuclear reaction

a rod of wood or steel or fiberglass that is used in fishing to extend the fishing line