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A small open circle marking a centre of symmetry.
Also known as: Centre of symmetry symbol, Inversion point mark, Centrosymmetric point symbol
The graphical symbol for a centre of inversion on a crystallographic space group diagram, drawn as a small open circle.
Marks a centre of inversion, a point through which every part of the structure has a counterpart at the opposite position.
Contexts: Laboratory
Divides all crystals into two classes, those that have one and those that do not, which determines whether a crystal can be piezoelectric or optically active.
Contexts: Laboratory
A very small open circle drawn on the diagram, distinguished from the filled marks by having no fill at all.