This is a Rotate Camera 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 13,000 icons, all in the same style and quality.
The icon is shaped like a rectangle with round edges but the top of it is not flat. The top is like a pyramid shape with a flat top. Inside the rectangle is a shape like a circle that doesn't fully connect because one end has an arrow shape on it.