Symbol 6335A from IEC 60417 - Title/Meaning: Negative acknowledgement; failure; NACK 
Function/description: To indicate the status of negative acknowledgement, or to indicate the failed status.
Own work using: iso.org/obp/graphics/grs/b78ff258-924f-4808-b74a-1a1d8775ea7d 200.png
Vectorization:  Mrmw