Thank you all for your answers. It's probably this earth shield as you folks say.
FYI the drawing comes from a console with various electronics, for ship navigation. This symbol can be seen in almost all of the 30 pages.
Dear all
I've come across this symbol on (most likely) korean electrical drawings, a wire(?) around other wires, sometimes connected to terminal, sometimes connected to ground.
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Does anyone know what is this about...
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