Symbol 6352 from IEC 60417 - Title/Meaning: Do not use power supply with damaged plug Function/description: To indicate that the power supply unit shall not be used, if pins of the plug part are damaged.
Additional information: 
For the portable transformers with integrated plugs according to IEC 60083 plug Type C.
Own work using: iso.org/obp/graphics/grs/532110fb-d617-4569-8a10-412b4a5c95f9 200.png
Vectorization:  Mrmw