Add a square on the outside of the Z-shape, and then rotate 180 degrees with the center line of the square as the axis, so that the left and right sides completely overlap into a group. Fold a graph along a straight line. If it can overlap with another graph, then the two graphs are said to be symmetrical about this straight line, which is called the axis of symmetry. Just add a square on the outside of the Z-shape, and then rotate the center line of the square by 180 degrees, so that the left and right sides can completely overlap into a group, thus forming an axisymmetric figure. Axisymmetric graphics are widely used in mathematics, geometry, physics and other fields, and have axisymmetric characteristics.