The shape has three equally spaced blades extending out from a center point, like a rotating fan.
This shape is often used for the vent or fan button on over-the-stove microwaves. The fan icon is a bit tricky. The original shape had thicker blades which made it harder to distinguish each blade. It was like a circle with a few inner cuts. This iteration has thinner blades that are more distinctive. Unfortunately the flat part of the blades create a straight line and when exploring the shape from the top left it can initially be confused with the plus tactile icon.