Symbol 0530 from ISO 7000 - Title/Meaning: Steam 
Function/description: To indicate water steam. To identify relevant controls. In application, care must be taken to avoid misunderstandings which may arise (for example, if the symbol is affixed to a rotary knob).
Own work using: iso.org/obp/graphics/grs/637cd987-4a27-4d9b-b6a3-5e1849a2432d 200.png
Vectorization:  Mrmw