Symbol 3411 from ISO 7000 - Title/Meaning: Engine rotational speed, second set speed Function/description: To identify the control that establishes the second set speed for the engine. To indicate the engine second set speed.
pay attention to orientation of symbolAdditional information: 
Use sequential numerals, in the location indicated, as needed for additional set speeds
Fonts shown are not restrictive.
Own work using: iso.org/obp/graphics/grs/d1f0a682-dda9-4abc-8695-cb7eff93add9 200.png
Vectorization:  Mrmw