Idea of USB Mini B Icon
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.
This page shows the different variations of the USB Mini B from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.