A dodecahedron (literally, "12 face solid").
The "regular dodecahedron" has 12 identical faces, all regular pentagons ("5 sided flat shape").
But there are many, many other 3d shapes with 12 faces, including the rhombic dodecahedron which has 12 identical faces, all 4 sided parallelograms.
what shape has 12 faces?
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It is called an endacehedron.
pentacontahedron
A decahedron.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
A 3-d shape made from pentagonal faces is a dodecahedron (12 sides).