This Calendar 5 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.
A rectangle with the short sides vertical. On top of this a rectangle of the same length, but 1/4 height. 1/4 of the way in from each side are two small upright rectangles, where half extends above the top of the small rectangle and half extends 1/4 into the small rectangle. Inside the large rectangle is the number "5"/