This is a 2 cm by 2 cm by 2 cm cube for calibrating your 3D printer. Print it, then check that all angles of the cube are exactly 90 degrees, the side are exactly 2cm long, the holes are exactly 1 mm, 2 mm and 3 mm wide on all sides and that the letters denoting the axes are recessed and embossed exactly 1 mm on all sides. If something is not right, make the needed changes in your slicing software and/or printer firmware and print again until everything is correct.