Reflection symmetry, line symmetry, mirror symmetry, mirror-image symmetry, or bilateral symmetry is symmetry with respect to reflection. That is, a figure which does not change upon undergoing a reflection has reflectional symmetry.
In 2D there is a line of symmetry, in 3D a plane of symmetry. An object or figure which is indistinguishable from its transformed image is called mirror symmetric.
Read more about Reflection Symmetry: Symmetry in Mathematics, Symmetric Function, Symmetric Geometrical Shapes, Mathematical Equivalents, Advanced Types of Reflection Symmetry
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