This is a USB Mini B 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 12,600 icons, all in the same style and quality.
The main shape is a rectangle that is longer than it is tall with five small rectangles connected to the inside of the top of the rectangle. On top of the rectangle is a shape that is three quarters of a rectangle with two diagonal lines that connect to the top of the main rectangle.