Symbol 3310 from ISO 7000 - Title/Meaning: Target; target rate; target value Function/description: To identify the control that sets the target rate or target value. To indicate the intended or specified quantity. To indicate that the target rate or target value has been reached.
pay attention to orientation of symbolAdditional information: 
This symbol does not specify the material to which the target rate applies
Symbol may be simplified at small size reproduction by removing the inner circle.
Own work using: iso.org/obp/graphics/grs/a40472b9-97b3-4f0d-90cd-cb0fc4ccde36 200.png
Vectorization:  Mrmw