A regular star pentagon, {5/2}, has five corner vertices and intersecting edges, while concave decagon, |5/2|, has ten edges and two sets of five vertices. The first are used in definitions of star polyhedra and star uniform tilings, while the second are sometimes used in planar tilings.

Does a star have sides?

A star has five corners, and 10 sides.

Why do stars have 5 sides?

Five-pointed stars were drawn on Egyptian jars dating back to 3100 BCE and on tablets and vases in Mesopotamia around the same time. ... They were often seen in letters between the followers of Pythagorus (aka Pythagoreans) as a symbol of their group.