This icon represents an open window. It is a large square with four smaller sqaures on each side. The sqaures on the side are one big on the bottom and one smaller one on the bottom to represent shutters.
This is the Open Window 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.