A 122-sided polygon is called a "hectaicosagon." The naming convention for polygons is based on Greek numerical prefixes combined with the suffix "-gon" for polygon. In this case, "hecta" represents 100, and "icosi" represents 20, making a total of 120 sides, with the additional two sides represented by the suffix "-gon."
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A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A 20-sided polygon is called an icosagon.
A million-sided polygon is called a megagon.
A 90-sided polygon is called an enneacontagon.