1. Designation for a self-synchronous motor system, consisting of a driver motor and one or more remote followers (or repeaters) with armatures remaining in synchronization with that of the driver. 2. Informal Navy designation for a wind-measuring system consisting of a wind vane and a bridled-cup anemometer, both of which are coupled to selsyn drivers and remotely record or indicate by means of the repeaters of the selsyn system.