This is a heptadecagon, a regular polygon with 17 sides and 17 angles all of which are congruent, centuries after Euclid’s Elements showed us that regular polygons could be inscribed within circles a young man by the name of Carl Friedrich Gauss came along and showed us that if the if the odd prime factors of a number n were also Fermat primes, it would be possible to inscribe a regular polygon of n sides within a circle with only a compass and straightedge, many more regular polygons were discovered soon after. This discovery catapulted him into the forefront of mathematics where he’d later be dubbed the Prince Of Mathematics.