It is an ice skate. It looks like a boot with laces all up the front. On the bottom of the boot a curve comes out at the heel and the toe, it's attached to a ski that is turned up at the front.
This is a Ice Skate 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 13,700 icons, all in the same style and quality.