Point group D2h
thingiverse
In crystallography, a set of symmetry operations, including rotations and reflections, forms a crystallographic point group when they leave a central point unchanged while rearranging other directions and faces of the crystal to match features of the same kind. The D2h (Vh) notation is used in Schoenflies notation for this type of operation, while Hermann–Mauguin notation employs the "mmm" designation. An orbifold can be represented as 2*. Custom orthorhombic cells can be created using OpenSCAD files. Additional details on crystallographic point groups and their applications can be found at https://www.staff.ncl.ac.uk/j.p.goss/symmetry/D2h.html
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