It's a logo of Santa's hat. On the bottom is a long rectangle curved upwards slightly representing the bottom frill. Then out of that comes the cap part with folds over slightly on top to the right with the circular ball at the end.
This is a Santas 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 13,900 icons, all in the same style and quality.