Symbol 3091 from ISO 7000 - Title/Meaning: Washing, very mild process, maximum 40 Celsius Function/description: To indicate that cleaning the textile article is allowed using very mild washing process at maximum temperature 40 degrees Celsius.
pay attention to orientation of symbolApplication referenced in: ISO 3758:2012
Additional information: 
Two small circles may be added below a reduced size number 40
Graphical symbol is based on the GINETEX care labelling system.
Own work using: iso.org/obp/graphics/grs/94e279f5-5a4b-41fa-a7ce-b05c0040e1cb 200.png
Vectorization:  Mrmw