In geometry, a pentagon (from the Greek πέντε pente and γωνία gonia, meaning five and angle) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.

Pentagón is a Lucha Libre, or professional wrestling ring character also referred to as a gimmick that has been played by a number of different people over the years. The character was created as an Evil twin of professional wrestler Octagón and is always a rudo, or heel character (A character portraying the "bad guy" in wrestling.) The character was created by Asistencia Asesoría y Administración (AAA) owner Antonio Peña in 1995, giving AAA the rights to the name "Pentagón", which meant that when wrestlers who played Pentagón left AAA they had to modify the name such as "Pentagón Black". There have been at least three distinctive versions of Pentagón