The icon looks like a triangle with curved edges laying vertical but the point facing left is missing. It is replaced with a smaller rectangle shape with curved edges. At the base of the vertical triangle which is facing left is a small backwards C shape at the center.
This is the Low Volume icon for Windows 10
. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.