A chiliagon is a polygon with a whopping 1,000 sides. However, there are several other words that can be used to describe this shape. For example, a 1,000-gon or a 1,000-sided polygon are both accurate ways to refer to a chiliagon. Other options include using number prefixes to indicate the number of sides, such as a dihectagon or a kiloagon. Alternatively, you could also use a more descriptive term such as a circular polygon or a regular polygon with 1,000 sides. Regardless of which term you choose, a chiliagon remains an impressive and rare geometric shape.