You may remember the infamous Susan B. Anthony dollar, a 13-sided coin that bombed miserably when it was offered as a substitute for the good old greenback.

Geometry Questions including "What is the circumference of a circle if the diameter is 18 cm" and "What is the name of a thirteen sided shape" ... ; What is the name of a thirteen sided shape?

Names for an n sided shape is?; A shape in 2D with n sides is called an n-gon. In higher dimensions, ... What is the name of a thirteen sided shape?; A 13-sided figure is called a triskadecagon.