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A filled triangle marking a threefold axis.
Also known as: Triad axis symbol, Three-fold axis mark, Triangle symmetry symbol
The graphical symbol for a threefold rotation axis on a crystallographic space group diagram, drawn as a solid triangle.
Marks a threefold rotation axis, an axis about which the structure repeats after a third of a turn.
Contexts: Laboratory
Has three points, following the family rule that the drawn figure's point count equals the order of the axis it marks.
Contexts: Laboratory
A small solid triangle with three equal sides, its three points marking the order of the axis.