I would call it a 9999999999999999999999999999999999-gon or better still, a (1034 - 1) gon. That way my audience will know what I mean without having to struggle with obscure Greek prefices. In my opinion, using prefices in such a case is pretentious and a futile attempt to impress rather than share information.
it is called a seven sided shape in Canada
A 90 sided shape is called Enneacontagon.
A 128-sided shape is called a hecatoicosioctagon.
An five sided shape is called a Pentagon
it is called a henagon is a one sided shape
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 4 sided shape is called a quadrilateral
A seven sided shape is called a heptagon.
A 128-sided shape is called a hecatoicosioctagon.
A 10-sided shape is called a decagon.
An five sided shape is called a Pentagon
9999999999999999999999999999999999 = 10,000,000,000,000,000,000,000,000,000,000,000
It is called a megagon. A ∞ sided shape is called an apeirogon.