Symbol 5110B from IEC 60417 - Title/Meaning: Stop Function/description: Alternative graphical symbol representation. Same meaning as 5110A.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/2dc1eef9-e30d-464e-b35e-939c6d8081f9 200.png
Vectorization:  Mrmw