Symbol 0518 from ISO 7000 - Title/Meaning: Counting 
Function/description: To indicate a counter or meter (for example, on operating controls of units).
Own work using: iso.org/obp/graphics/grs/4e4deb13-a5d5-43a8-abcf-60d07e50d0be 200.png
Vectorization:  Mrmw