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A capital R marking a rhombohedral setting.
Also known as: Rhombohedral centring, Trigonal R symbol
The lattice centring letter R, marking a rhombohedral lattice which may be described in either of two settings.
Marks a rhombohedral lattice on a space group symbol.
Contexts: Laboratory
May be given in a hexagonal or a rhombohedral setting, so the same structure appears with different cell parameters depending on which was chosen, and papers state which.
Contexts: Laboratory
A single capital letter at the head of a space group symbol, unique in standing for a lattice with two accepted descriptions.