Idea of Stop Icon
It's a very simple drawing of a square. There is nothing remarkable about the square, it is a computer drawn square. The square is drawn with medium thick lines. There is nothing inside the square.
This Stop icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,100 icons, all in the same style and quality.