A hexadecagon is a polygon with sixteen sides and sixteen angles. The term comes from the Greek word "hexadeca," meaning sixteen, and "gon," meaning angle. Each internal angle of a regular hexadecagon measures 157.5 degrees, and the sum of all internal angles is 2,520 degrees. Hexadecagons can be found in various fields, including mathematics and architecture. They are often studied in geometry for their unique properties and can be used in design patterns, such as in tiles or flooring. Understanding hexadecagons helps in grasping more complex geometric concepts.