Symbol 6206 from IEC 60417 - Title/Meaning: Caution, electric field hazard Function/description: To identify equipment having inaccessible conductors with high static or alternating voltage, creating a risk of inducing potentially hazardous discharge phenomena or currents in body parts.
Additional information: 
For technical details, see IEC 60519-1.
In case of application in a warning sign the rules according to ISO 3864 apply.
See also symbols 6204 and 6205.
Own work using: iso.org/obp/graphics/grs/96499631-3546-4407-9989-87a88177dd4b 200.png
Vectorization:  Mrmw