Idea of Junction Icon
It's an icon depicting outgoing. A black line making a shape to that of a rectangle, sits with the longer side horizontal. The top to this rectangle is open except a small portion at either end. Where the rectangle is open at top, two line figured arrows expel up and outwards in separate directions from the center. The left out towards left and right out to the right.
This is a Junction icon. It is available in PNG and vector. Downloading is free for PNGs up to 100x100px.