It is an arrow pointed down. The arrow is black on a solid background. There is one solid vertical line. From the bottom of that line there are two smaller black lines extending diagonally up to the right and left at 45 degree angles.
This is the Down Arrow 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.