A Dodecahedron has 12 pentagonal faces.
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A 2-dimensional figure with 12 sides is called a dodecagon. A 3-dimensional figure with 12 sides (faces) is called a dedecahedron.
Three dimensional shapes with faces are called polygons. They are named using prefixes derived from Latin, so a 12 sided polygon is named a dodecagon, where dodeca- means twelve.
A three-dimensional figure with 30 faces is called a triacontahedron.