This is a picture of a brick wall that is three layers high. the bricks are all stacked in a pattern so that they do not match. it is showing that it's a block wall
This Block 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 5,700 icons, all in the same style and quality.