It's a logo for a person doing a pushup as an exercise. The person is parallel to the floor, with their stomach facing the floor and legs straight out behind them. Their arms are propping them up so they aren't laying down.
This is a Pushups 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.