Symbol 6389 from IEC 60417 - Title/Meaning: Pulsed Function/description: To identify the reference to control welding characteristic by pulse value.
Additional information: 
See also IEC 60417-5130, IEC 60417-5131 and IEC 60417-5842.
Own work using: iso.org/obp/graphics/grs/ddc02b3d-b4d7-4f4b-ac80-d2511f2d1272 200.png
Vectorization:  Mrmw