The name of a 16 sided polygon is Hexdecagon.
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A sixteen-sided regular polygon is called a hexadecagon or a hexakaidecagon.
I think it's called a decahexagon
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
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon