Symbol 3088 from ISO 7000 - Title/Meaning: Washing, very mild process, maximum 30 Celsius Function/description: To indicate that cleaning the textile article is allowed using very mild washing process at maximum temperature 30 degrees Celsius.
pay attention to orientation of symbolApplication referenced in: ISO 3758:2012
Additional information: 
A single small circle may be added below a reduced size number 30
Graphical symbol is based on the GINETEX care labelling system.
Own work using: iso.org/obp/graphics/grs/98043852-9490-4b79-8569-f25bb5681649 200.png
Vectorization:  Mrmw