This icon is a part of a collection of Wartość ekspozycji 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 logo is a square separated into two diagonally. On the left side of the square there's a plus sign. And on the right side of the square there's a minus sign. The square is composed completely of black lines.