It is called a dretagalon
you call a seven sided shape a heptagon.
A seven sided shape is called a heptagon.
Icosahedron
A seven-sided shape is known as a "Heptagon"
a heptagon, because hepta means seven and gon mean sided ... so a heptagon
An 11 sided shape is an Eptogon
Most mathematicians would use "24-gon." You can use tetracosagon or icositetragon
A 12-sided shape is called a dodecagon.
A 30 sided shape is called a Triacontagon.
You can call a 101-sided shape a hecatontakaihenagon. The "hecto-" in the word means "one hundred" and the "henagon" means "one-sided geometric shape."
A nine sided shape or polygon is called a nonagon.
118-sided shape is called a hectadecakaioctagon.