Symbol 5612 from IEC 60417 - Title/Meaning: Oven, lower heating Function/description: To identify the control and/or the operating condition of an oven, lower heating.
Additional information: 
The meaning of the graphical symbol depends on its orientation
Published in: Supplement N, 1995,3C(Central Office)192
Own work using: iso.org/obp/graphics/grs/5852aec9-5c26-4bc9-a435-2abc986d8962 200.png
Vectorization:  Mrmw