I would guess it would be called something like a diacosiapentagon (since I think diakosia pente is the Greek for 205.).
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A polygon with 6 sides is called a hexagon.
A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
HexagoN
Two adjacent sides of a polygon will meet at a vertex. End points of any other pairs of sides do not have a specific name.
It is enneadecagon (or enneakaidecagon or nonadecagon).