A hecatomyriagon is a polygon with 100,000 sides. The name derives from the Greek words "hekaton" meaning hundred and "murios" meaning thousands. While it is a theoretical shape, it is difficult to visualize due to the sheer number of sides, and its interior angles are very close to 180 degrees, making it appear almost like a circle. In practical applications, hecatomyriagons are rarely used due to their complexity.