Definition: The word "symmetr" in mathematical terms refers to a property or measure that is invariant with respect to rotation or translation. In geometry, symmetries are properties that maintain their shape and size under rotations and translations. For example, two lines that are parallel can be rotated along any line to form a mirror image of themselves, regardless of the angle between them. Symmetry in mathematics refers to the property that every element in a set can be expressed as an equivalence class under certain operations (such as addition or multiplication) on that set. Symmetries have important applications in fields such as computer graphics and computer vision. A common example of a symmetry is the mirror image property of lines, which holds for any two lines that are parallel but not necessarily identical. The mathematical definition of symmetr allows us to define other properties like areas or volumes under transformations.