This is a Last 72 Hours 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 12,800 icons, all in the same style and quality.
The image is of a clock face. The image is a circle with dots along the inside of the circle's edge. The numbers seven and two are in the center of the circle. The outer edge of the circle forms an arrow that is pointing counter clockwise.