Symbol 2166 from ISO 7000 - Title/Meaning: Dark 
Function/description: To identify a pre-set adjustment of the machine contrast to produce a darker copy, for example on an officedocument copying machine.
Own work using: iso.org/obp/graphics/grs/9cd0395a-0011-4453-9118-9f1c0bb38619 200.png
Vectorization:  Mrmw