Hi All, Using (Mirror + Translation in 2D). I see that Diamond and Center Rectangular Lattice in 2D has the same Symmetry i.e: 1)Horizontal Mirror Plane 2)Vertical Mirror Plane 3)2-Fold Rotation Axis. and Diamond has Smaller Area. Then why we say Center Rectangular has higher Symmetry and we take it as the Standard Cell. Image Attached. Reference, Edx.org, Course: Symmetry, Structure and Tensor Properties of Materials, Lecture 7. Thanks.