Symbol 5638 from IEC 60417 - Title/Meaning: Emergency stop Function/description: [To identify an emergency stop control device. This symbol shall be used in place of symbols 5110 or 5178 in cases where the safety of users of electrotechnical machines and equipment is the primary concern.]
Additional information: 
The use of this symbol is specified in IEC 61310-1.
For additional requirements concerning the shape, colour and arrangement of emergency stop actuators, see IEC 60204-1
Published in: New edition, 1998;3C/358/FDIS;3C/331/CDV;3C/298/CD
Own work using: iso.org/obp/graphics/grs/64a95054-bd47-49dc-8532-79dd21858302 200.png
Vectorization:  Mrmw