Rotational symmetry occurs when an object can be rotated around a central point and still look the same at certain angles. For example, a star with five points has rotational symmetry because it appears unchanged when rotated by 72 degrees. The number of times an object matches its original shape during a full 360-degree rotation is called its order of symmetry. Many shapes exhibit rotational symmetry, including circles, squares, and triangles. A circle has infinite rotational symmetry because it looks the same at any angle. In contrast, a square has rotational symmetry of order four, as it matches its original shape every 90 degrees.