Petagonal

Petagonal refers to anything having the shape of a pentagon. A pentagon is a polygon with five sides and five angles. The term "petagonal" is most commonly used in geometry to describe shapes, figures, or arrangements that exhibit this five-sided characteristic. For example, a petagonal prism has two pentagonal bases and five rectangular sides. A petagonal pyramid has a pentagonal base and five triangular faces that meet at a point.

The properties of a pentagon, and therefore of things described as petagonal, are well-defined. A regular pentagon has five equal sides and five equal interior angles, each measuring 108 degrees. Irregular pentagons have sides and angles of varying lengths and measures. The term can also be used more broadly to describe something that has five parts or aspects, even if not strictly geometric. For instance, a "petagonal structure" could refer to an organization with five main divisions or a process with five distinct stages. In crystallography, petagonal symmetry is not possible for single crystals due to the nature of atomic arrangements, but it can appear in twinned crystals. Overall, "petagonal" denotes a characteristic related to the number five in a spatial or structural context.