That is a pentadecagon (or quindecagon or pentakaidecagon.) I doubt anyone would argue with 15-gon, though.
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you call a two dimensional shape with six sides a hexagon
A shape with 8 sides is an octagon.
Triangle is a shape with three sides.
A shape with straight sides is called a polygon. But it can have 3 or 4 sides as well.
It is a shape with fifteen sides. It goes on to hexdecahedron, sepdecahedron, octdecahedron, nondecahedron, and then I don't know.