If you are seing it on a computer screen, a circle. (No jokes)
If you arent seing it on a computer screen, and all sides are equal, it is a polygon.
About the computer screen. There arent enough pixels on a screen to display a 15448946512052155 sided shape, so it would just appear as a circle.
it is called a seven sided shape in Canada
The 22 sided shape is called a: ICOSIKAIDIGON
A 90 sided shape is called Enneacontagon.
Hommasquabblelagagon
A five-sided shape is called a pentagon.
A seven sided shape is called a heptagon.
a 4 sided shape is called a quadrilateral
A 128-sided shape is called a hecatoicosioctagon.
An 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.
A million sided shape shape is called a megagon.