The name of a 16 sided polygon is Hexdecagon.
A sixteen-sided regular polygon is called a hexadecagon or a hexakaidecagon.
polygon
hexadecagon
16
A sixteen-sided polygon is called a hexadecagon.(see related link for list)A Hexadecagon.
I think it's called a decahexagon
A 16-sided figure is known as a hexakaidecagon, 16(sixteen)-gon, or hexadecagon.
11
One billion-sided polygon = GIGAGON
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon