Symbol 3410 from ISO 7000 - Title/Meaning: Engine rotational speed, first set speed Function/description: To identify the control that establishes the first set speed for the engine. To indicate the engine first set speed.
pay attention to orientation of symbolAdditional information: 
Fonts shown are not restrictive.
Own work using: iso.org/obp/graphics/grs/aca3288d-576a-4fd8-92e8-3a558808410b 200.png
Vectorization:  Mrmw