It is a logo of a heat map. there is a 90 degree right angle located at the bottom left and inside the right angle are various sizes of circles. Some circles small some big. The bigger the circles are it is indicating the higher in temperature the heat is.
This is the Heat Map 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.