A figure composed of two equal triangles intersecting so that each side of one triangle is parallel to a side of the other, and the six points coincide with those of a hexagon.
(b)
In Chinese literature, one of the sixty-four figures formed of six parallel lines (continuous or broken), forming the basis of the I Ching (Yih King), or "Book of Changes."
... demon-repelling power has been attributed to the fact that it resolves itself into three triangles, and is thus a triple emblem of the Trinity. Paracelsus, according to the above-mentioned writer, ascribed a similar, although less marked virtue, to the hexagram. ... — Primitive Psycho-Therapy and Quackery • Robert Means Lawrence
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