This Saturday 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 4,400 icons, all in the same style and quality.
The image is a square with two little tabs at the top. It looks like the page of a calendar. There are two letters on the image. In the center of the large square part is a the capital letter S and the lowercase letter a.