It's a logo of a key changing hands. One hand extends from the right on bottom with its palm facing up. The other hand extends from the left on top and is dropping a key into the other hand.
This is a Lease 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.