This is the Zmień rozmiar 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.
There is a square with a solid stroke with an arrow coming out of the top right corner, but all of this is enclosed in a larger square which has a dotted stroke, except for the bottom left quarter of the square, where the original square is solid.