Symbol 5184 from IEC 60417 - Title/Meaning: Clock; time switch; timer Function/description: To identify terminals and controls related to clocks, time switches and timers.
Additional information: 
Published in: Supplement C, 1977
Own work using: iso.org/obp/graphics/grs/24a7a200-2452-4228-90fd-563f20d6703d 200.png
Vectorization:  Mrmw