It is a 19 sided polygon.
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Nonadecagon
It is a nonadecagon polygon of 19 sides
A nineteen sided polygon is called a Nonadecagon or an Enneadecagon.
A 19-sided polygon is an enneadecagon (also enneakaidecagon or nonadecagon).
I'm assuming you're talking about the regular polygon with one more side than a hexagon... It's called a Heptagon, from the ancient Greek word "Hepta", meaning seven. Hope this helps.