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1. the circular graduated disc of various measuring instruments
a. the control on a radio or television set used to change the station or channel
b. the panel on a radio on which the frequency, wavelength, or station is indicated by means of a pointer



a subassembly of a telephone that is used to control the operation of the apparatus in an automatic telephone exchange in order to establish a connection to the subscriber being called. Dials may be of the disk or push-button types, depending on the method of selecting the desired number.


In automatic telephone switching, a type of calling device which, when wound up and released, generates pulses required for establishing connections.
(design engineering)
A separate scale or other device for indicating the value to which a control is set.