This is a Calendar 8 icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,600 icons, all in the same style and quality.
This icon represents a calendar 8. It is a square shape with the number 8 in the middle. A section is lined off at the top, separating it from the larger bottom portion, with two lines, one on each side.