This is a logo for a calendar. The shape of the calendar is a typical flip daily calendar: it is a square displaying only one number (the date). It displays the number 27 in the center of it.
This Calendar 27 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 6,000 icons, all in the same style and quality.