Symbol 2810 from ISO 7000 - Title/Meaning: Fast operation Function/description: To indicate the fast setting of a function or mechanism; to identify the switch or switch position by which the rate of operation is increased or set to its fast position.
pay attention to orientation of symbolAdditional information: 
The fast setting may be a distinct control (for example, a separate button) or a position to which a control is moved (for example, one side of a rocker control or one end of the motion of a lever control).
Own work using: iso.org/obp/graphics/grs/fdfa7a73-39a8-47a2-8725-878995593f1c 200.png
Vectorization:  Mrmw