Symbol 3312 from ISO 7000 - Title/Meaning: Target rate per hour Function/description: To identify the control that sets the target rate per hour. To indicate the target rate (quantity) per hour.
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/167d95a0-943a-48ef-bf0a-698dc279c3c2 200.png
Vectorization:  Mrmw