For example, in 3D these equivalent rectangle and rhombic geometry diagrams of A ~ ~ 3 : and , the first doubled with square brackets, [[3 ]] or twice doubled as [2[3 ]], with [2], order 4 higher symmetry. To differentiate the second, angled brackets are used for doubling, <[3 ]> and twice doubled as <2[3 ]>, also with a different [2], order 4 symmetry. Finally a full symmetry where all 4 nodes are equivalent can be represented by [4[3 ]], with the order 8, [4] symmetry of the square. But by considering the tetragonal disphenoid fundamental domain the [4] extended symmetry of the square graph can be marked more explicitly as [(2,4)[3 ]] or [2,4[3 ]].