Symbol 2884 from ISO 7000 - Title/Meaning: Engine speed, slow; low engine speed Function/description: To identify the control position for the low (slow) engine speed setting. To indicate that the engine is operating at the low (slow) engine speed setting.
pay attention to orientation of symbolAdditional information: 
This symbol incorporates the ""slow operation speed"" symbol (ISO 7000-2811) into the ""engine"" symbol (ISO 7000-1156).For consistency with ISO 7000-1389, ""n/min"" may be added below the engine symbol element.
Own work using: iso.org/obp/graphics/grs/446ba7e1-97dd-4159-8910-cbd6f836eda6 200.png
Vectorization:  Mrmw