It is a 14-gon. That is what most normal mathematicians would call it in an effort to communicate effectively.
However, if you want to be pretentious and unhelpful, you could call it a tetradecagon.
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A 14-sided and 3-dimensional shape is called either a tetrakaidecahedron or tetradecahedron. This 14-sided polyhedron can have six quadrilateral and eight hexagonal faces.
A 14 sided polygon is called a tetradecagon.
a tetradecagon
The name of a 14 sided polygon is Tetradecagon.
tetradecagon (or tetrakaidecagon)