This is a picture of a top hat that is upside down. the opening of the hat is circular and it has a circular rim going around it. you can see a line across the center of the hat.
This is a Black Hat 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 13,100 icons, all in the same style and quality.