A 999 sided shape is simply known as a 999 sided shape.
999-agon
The more sides you add to a regular shape, the more it tends towards being a circle. This is a 999 sided shape called an enneahectaenneacontakaienneagon (looks pretty much like a circle)
it is called a seven sided shape in Canada
An five sided shape is called a Pentagon
a 69 sided shape is called a sexagon
A 90 sided shape is called Enneacontagon.
I would just call it a 999...999-sided shape. It ain't really useful to invent fancy names for such figures.
The more sides you add to a regular shape, the more it tends towards being a circle. This is a 999 sided shape called an enneahectaenneacontakaienneagon (looks pretty much like a circle)
it is called a seven sided shape in Canada
a one sided shape is called a henagon and a 2 sided shape is called a digon
A 10-sided shape is called a decagon.
An five sided shape is called a Pentagon
A 150 sided shape is called heptaconta.
Hommasquabblelagagon
The 22 sided shape is called a: ICOSIKAIDIGON
A five-sided shape is called a pentagon.
A 128-sided shape is called a hecatoicosioctagon.
a 69 sided shape is called a sexagon