It's a polygon with 14 points (If the two ends meet) or 16 points (If the two ends don't meet).
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A 15-sided figure is called a pentadecagon.
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heptagon * * * * * No. That is a 7 sided figure. A 17 sided figure is a heptadecagon.
Pentadecagon, although most mathematicians would use "15-gon."
Assuming the question is about a 15 sided figure rather than a 15 shaped figure, it is most commonly known as a pentadecagon, less so as a quindecagon, and even less familiarly as pentakaidecagon.
A ten sided figure is a decahedron.
An eight sided figure is an octagon.
In 2 dimensions, a regular 5 sided figure is a pentagon. In 3 dimensions, there is no regular sided 5 sided figure. The tetrahedron is a regular 4 sided figure and a cube is a regular 6 sided figure.
Icosagon is a 20 sided figure.
A six sided figure is called a hexagon.