👉 Symmetry is a property that allows objects or entities to be alike in appearance, size, shape, or other characteristics without being identical. In physics and mathematics, symmetry is often used to describe patterns of behavior or structure that are repeated over and over again. This includes the properties of regular shapes like squares, rectangles, circles, and triangles, as well as the principles of symmetry in nature like the symmetry of mirrors and the symmetry of a prism.