plane of mirror symmetry
plane of mirror symmetry[′plān əv ′mir·ər ‚sim·ə·trē]
Also known as mirror plane of symmetry; plane of symmetry; reflection plane; symmetry plane.
In certain crystals, a symmetry element whereby reflection of the crystal through a certain plane leaves the crystal unchanged.
An imaginary plane which divides an object into two halves, each of which is the mirror image of the other in this plane.