Symbol 3100B from ISO 7000 - Title/Meaning: Flat drying in the shade Function/description: To indicate that drip drying in the shade is allowed in the natural drying process.
pay attention to orientation of symbolApplication referenced in: ISO 3758:2012
Additional information: 
The meaning of this symbol depends on its orientation.
Own work using: iso.org/obp/graphics/grs/2fcdc579-940b-4fba-8df4-ffd2cb623ee7 200.png
Vectorization:  Mrmw