This icon represents transfer between users. It is two people's head side by side touching at the shoulder. There are two dots under the shoulders with two lines making arrows pointing opposite, one left and one right.
This is a Exchange 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.