A gigagon is a two-dimensional polygon with one billion sides. It has the Schläfli symbol \{ \left\langle 10,9 \right\rangle \} (using Bowers' arrays).

To an unaided observer, a gigagon resembles a circle. A gigagon with a radius of 1 ly (approximately the size of 100 solar systems) would have its edge length differ from a circle by only 9.78 cm.

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