If it's a 2-dimensional shape, like lines drawn on paper, a 12 sided shape is called a dodecagon. If it's 3-dimensional, like a 12-sided die, then it's called a dodecahedron.
dodecagon
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a cube or a dodecahedron * * * * * Not a cube, which has only six sides!
A dodecagon has 12 sides.
A shape with 12 sides is known as a Dodecagon.
A shape with ten sides is called a decagon
A shape with three sides is called a triangle.