Symbol 2952B from ISO 7000 - Title/Meaning: Not suitable for driving and road use Function/description: On sunglasses, to identify Category 4 ""extra dark"" sunglasses with a luminous transmittance that is too low for safe use when driving.Note: Forms part of series of five symbols depicting various degrees of sunglare reduction
pay attention to orientation of symbolAdditional information: 
Similar symbol has been in widespread use by the sunglass industry for some time.
Own work using: iso.org/obp/graphics/grs/fb94042a-434a-426b-9b1d-7d1c5d2b752f 200.png
Vectorization:  Mrmw