An item having a moving plunger type core which travels parallel to the longitudinal axis of the coil(s), and which is primarily designed to perform the dual function of closing the circuit of a starter, engine, electrical and actuating the starter engaging mechanism. it must have provisions for attaching the mechanical linkage for actuating the engaging mechanism if the linkage is not included. may have provisions for manual actuation. without contacts this item is known as a solenoid, electrical. without provisions for attaching mechanical linkage this item is known as a relay, electromagnetic. see also switch, engine starter, electrical.