Symbol 0160 from ISO 7000 - Title/Meaning: Calibration 
Function/description: To identify the control for the release or adjustment of a calibration procedure. To identify the calibration reference marks on scales. To indicate that the equipment is in calibration mode.
Own work using: iso.org/obp/graphics/grs/eb70a5a8-fd39-47ef-bf84-bc969ee38cda 200.png
Vectorization:  Mrmw