Symbol 6287 from IEC 60417 - Title/Meaning: Negation Function/description: To indicate the function of negation in accordance with IEC 80416-1.
Additional information: 
See also IEC 60417-5503.
Own work using: iso.org/obp/graphics/grs/845b827c-fd74-45bd-9787-fd6383aa1484 200.png
Vectorization:  Mrmw