A non-convex kite is often called a dart, a term used by Roger Penrose in his proof on a non-periodic tiling of the plane (see also Penrose tiling). Proclus referred to this shape as a "four-sided triangle" and spoke of it as a geometric paradox. John Conway has pointed out that there is no special name for a quadrilateral that has two pairs of equal sides that, unlike in the case of a kite, are not parallel sides. He proposed the name strombus for such a figure, from the Greek for a spinning top.
Related category POLYGONS
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