Symbol 0636A from ISO 7000 - Title/Meaning: Rear window demisting and defrosting 
Function/description: To identify the control that distributes air flow or a low electrical current to the rear window to aid in removing frost, fog and mist. To indicate the operational status of rear windscreen demisting and defrosting.
Own work using: iso.org/obp/graphics/grs/bd92e0cd-074a-44cc-bcf4-67fe53033deb 200.png
Vectorization:  Mrmw