It is the outline of two footprints. There is a left and a right footprint. Both the left and right foot each have 5 toes. This looks like a souvenir keepsake a parent would make of their childs footprints.
This is a Baby Feet 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 13,300 icons, all in the same style and quality.