Point group D4h

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In crystallography, a point group is a set of symmetry operations that leave a central point fixed while moving other directions and faces of the crystal to the positions of features of the same kind. These operations include rotations or reflections. A dual-extrusion model uses this concept. The crystal's tetragonal cell is defined by its symmetries. The Schoenflies notation, D4h, describes a specific type of symmetry operation that combines rotation and reflection. Similarly, Hermann–Mauguin notation, 4/mmm, describes the same symmetry operation in a different way. Another way to describe this operation is using orbifold notation, *422. OpenSCAD files are available for creating custom cells with these symmetries. More information can be found at https://www.staff.ncl.ac.uk/j.p.goss/symmetry/D4h.html.