Symbol 3103B from ISO 7000 - Title/Meaning: Line drying Function/description: To indicate that line drying 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/cfb7c768-d134-41c3-9834-3de666113a43 200.png
Vectorization:  Mrmw