Symbol 5575 from IEC 60417 - Title/Meaning: Filter cleaning / changing Function/description: To identify or advise cleaning or changing a filter or strainer.
Additional information: 
Published in: Supplement N, 1995,3C(Central Office)192
Own work using: iso.org/obp/graphics/grs/f37943ab-b552-4bf5-8780-4a91f7dda154 200.png
Vectorization:  Mrmw