Operating Coil, Relay Coil - Application: multiwinding coil (2 windings shown) - The ends of a given winding shall be shown directly opposite each other on opposite sides of the core, or
adjacent to each other on the same side of the core.
Derived from this file.
(in English) (1993)  315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 57  DOI:  10.1109/IEEESTD.1993.93397. ISBN:  0738109479.
Michel Bakni