Apeirogon
| Apeirogon (regular) | |
|---|---|
| Edges and vertices | ∞ | 
| Schläfli symbol | {∞} | 
| Coxeter–Dynkin diagrams | |
| Internal angle (degrees) | 180° | 
| Dual polygon | Self-dual | 
In geometry, an apeirogon (from Ancient Greek ἄπειροv apeiron 'infinite, boundless' and γωνία gonia 'angle') or infinite polygon is a polygon with an infinite number of sides. Apeirogons are the rank 2 case of infinite polytopes. In some literature, the term "apeirogon" may refer only to the regular apeirogon, with an infinite dihedral group of symmetries.