It's a drawing of a circle, with two small dimples. One dimple is at about 11 o'clock and the other one is at about 3 o'clock. Inside of the circle, on the right side, are evenly spaced dots in a sideways W pattern. On the left side of the circle there are two small half circles.
Related to Moon Phase Icon
Related icons are the icons with matching tags, as well as all cinema icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors