This icon is a part of a collection of Pocztówka flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality. Both PNG and vector are available.
The icon is shaped like a horizontal rectangle with a dotted line at its center. At the top right corner is a small square shape. Under the square at the bottom center are three horizontal lines, one on top of each other.