Symbol 1657 from ISO 7000 - Title/Meaning: Area worked 
Function/description: To indicate the area that has been worked by a machine. To identify the control for specifying an area.
Own work using: iso.org/obp/graphics/grs/7b920e2f-a9cc-4bb7-8fd9-6632331a9dc1 200.png
Vectorization:  Mrmw