Symbol 1953 from ISO 7000 - Title/Meaning: Document face down 
Function/description: To indicate that the document must be in the image down position, for example for transmission, copying or scanning.
Own work using: iso.org/obp/graphics/grs/f9df34e1-02ba-451a-8a26-1dd4dc27eda6 200.png
Vectorization:  Mrmw