Symbol 5110A from IEC 60417 - Title/Meaning: Stop Function/description: To identify the control or the indicator to stop the active function.
Additional information: 
This means stopping either by electrical or mechanical disconnection.
On audio video equipment, the symbol 5110B is preferred alternative and should be used in combination with any of the symbols 5107B, 5108B, 5111B and 5124B
Published in: First edition, 1973;3C/1145/FDIS
Own work using: iso.org/obp/graphics/grs/0c6ec8e6-06c7-4b6e-ad64-15e4d0fdffc6 200.png
Vectorization:  Mrmw