There is no specific name for "12 or more" sides. A 12 sided plane figure is a dodecagon. More generally, a plane figure bounded by 3 or more sides is a polygon.
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A shape with 12 sides is called a dodecagon.
The Dodecahedron is the shape that has twelve sides.
=A shape with 12 sides is a Dodecagon.=
A dodecagon has 12 sides.
dodecagon- 12 sides