A 0-sided shape is called a circle. Yes, I know it sounds like a trick question, but a circle technically has 0 sides because it's defined by its curved boundary. So, there you have it, a shape with no sides but still manages to be round and fabulous.
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The 22 sided shape is called a: ICOSIKAIDIGON
Hommasquabblelagagon
A five-sided shape is called a pentagon.
A 10-sided shape is called a decagon.
It is called a megagon. A ∞ sided shape is called an apeirogon.