Wielokrotny wybór and other 85,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
The image is of three squares that are horizontally lined up. They are not touching each other. To the right of the squares are horizontal lines of the same length. The top and bottom squares are filled in. The middle square is blank.