Well, darling, an 18-sided shape is called an octadecagon. It's a mouthful to say, but hey, at least now you can impress your friends with your geometry knowledge. Just don't ask me to draw one, honey, I'm not an artist.
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A 12-sided shape is called a dodecagon.
All I can tell you is that a 16 sided shape is called a Hexadecagon
Parallelogram
Tetrahaidecahedron
Icosahedron