Symbol 5007 from IEC 60417 - Title/Meaning: ""ON"" (power) Function/description: To indicate connection to the mains, at least for mains switches or their positions, and all those cases where safety is involved.
Additional information: 
The meaning of this graphical symbol depends upon its orientation.
See also symbol 5264
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/cf998fb2-4b8d-433c-8c78-42639ceffc2e 200.png
Vectorization:  Mrmw