This page shows the different variations of the Zacisk do papieru 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.
It is a combination of 3 shapes. On the bottom is a short but wide rectangle. Directly on top of that is an upside-down isosceles trapezoid. Layered on top of the trapezoid, but also directly on top of the base rectangle, is a triangle that instead of coming to a point at top has an oval-like bulb.