A tetradecagon, sometimes called a tetrakaidecagon, is a 14-sided polygon.
Tetradecagon
See also
Polygon, Regular TetradecagonExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Tetradecagon." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Tetradecagon.html