Symbol 6408 from IEC 60417 - Title/Meaning: Capacitive VDIS Function/description: To indicate that the structure of the coupling system is capacitive.
Additional information: 
See also IEC 60417-6409.
For technical detail including the location of the graphical symbol, see IEC 62271-213.
Own work using: iso.org/obp/graphics/grs/aed72afb-324e-488b-a8fb-6db3841fd322 200.png
Vectorization:  Mrmw