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A rotation symbol with an open circle inside.
Also known as: Inversion axis symbol, Bar axis symbol, Improper rotation crystallography
The graphical symbol for a rotoinversion axis, a rotation followed by inversion through a point on the axis.
Marks a rotoinversion axis, a rotation followed by inversion through a point lying on that axis.
Contexts: Laboratory
Combines the marks of its two component elements into one figure, which is why the notation is compositional rather than a list of special cases.
Contexts: Laboratory
The solid figure of a rotation axis with a small open circle set inside it, combining the two elements' own marks.