Symbol 5492 from IEC 60417 - Title/Meaning: Enlargement of the cooking zone, oval Function/description: To identify an indicating or control element for a unilateral round enlargement of the cooking zone.
Additional information: 
Published in: Supplement O, 1996,3C/295/DIS
Own work using: iso.org/obp/graphics/grs/adb83a53-3d41-4fa1-a5fc-7d633e26efb3 200.png
Vectorization:  Mrmw