It's a logo for a human bone which looks like a leg bone. The bone is tilting from left to right with a heart shape at the bottom left of the icon. On the top right the bone has been broken off an is dangling from the bone.
This is a Human Bone 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.