It is an icon of a pretzel. It looks like one piece of string that is looped inside of itself. Both ends come out of the middle and go in opposite directions at the bottom.
This is a Pretzel 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.