This page shows the different variations of the pchnij do tyłu from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
The image looks like a rectangle that has rounded out corners on the right side. There are also lines that stick out a little on the right side near the middle of the rectangle. And on the left side, almost connected to the rectangle, an arrow is pointing to the left near the middle.