Symbol 5493 from IEC 60417 - Title/Meaning: Enlargement of the cooking zone, bilateral Function/description: To identify an indicating or control element for a bilateral enlargement of the cooking zone.
Additional information: 
Published in: Supplement O, 1996,3C/295/DIS
Own work using: iso.org/obp/graphics/grs/f85fe93f-4be7-4bb8-a7c2-c9de3381da0c 200.png
Vectorization:  Mrmw