This looks mostly like a square. The top of the square actually comes to a point. There is a rectangle going horizontal in the middle of the square, lying along the square's bottom side.
This is a Hangar 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.