Nonagon, a nine-sided polygon, can also be replaced with some synonyms such as enneagon, nonakaicosagon, novagon, nonadecagon, and nine-gon. Enneagon and novagon both derive from the Greek prefix for 'nine', ennea, while nonakaicosagon comes from a combination of Greek and Latin words. Nonadecagon comes from the Latin prefix for 'nineteen' as it has 19 sides. However, 'nine-gon' is the most commonly used synonym for nonagon. Nonagon is a geometric shape that has been used in many architectural and decorative designs throughout history such as in the construction of temples and the creation of artwork.