Reflection or line of symmetry is the line through a shape where on half is the mirror image of the other. The mirror line is also called the line of symmetry.
Rotational symmetry is where an object fits exactly onto itself when it is turned through a point at its centre.
Order of rotational symmetry is the number of times an object fits onto itself in a 360° turn. For example, an order of rotational symmetry of one, is where the object has to be rotated through 360° before it fits onto itself again.
Reflection symmetry in 3-D shapes
A 3-D shape can at times be divided into two symmetrical parts. This shaded area in the cube below is called a plane of symmetry.
Eight planes of symmetry can be drawn for a cube, as follows: