Symbol 3670 from ISO 7000 - Title/Meaning: Engine rotational speed, sensitivity setting Function/description: To identify the control that sets or adjusts the sensitivity setting for the engine. To indicate the sensitivity setting for the engine.
Additional information: 
The sensitivity of the engine is the amount of change in the engine speed relative to variation in engine load. The greater the change in engine speed after a change in engine load, the greater the engine sensitivity.
Own work using: iso.org/obp/graphics/grs/c1fff4fb-b730-46fa-912f-c8b3c27f6975 200.png
Vectorization:  Mrmw