Symbol 6335B from IEC 60417 - Title/Meaning: Negative acknowledgement; failure; NACK 
Function/description: Alternative graphical representation. Same meaning as IEC 60417-6335A.
Own work using: iso.org/obp/graphics/grs/cda52127-0cc7-49cc-8666-042f731ff74a 200.png
Vectorization:  Mrmw