Provided we are talking about a 2D figure with straight sides, it is an octadecagon.
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An eighteen sided shape is called a Octadecagon, or a Octakaidecagon.
The name of a tweleve sided shape is a dodecagon.
a twelve sided shape is called a dodecagon.
A Tetracontakaitetragon is a forty - five sided shape ...
The name of an eleven sided geometric shape is a Hendecagon or endecagon.