A three-dimensional geometric solid with twelve faces, typically pentagonal; one of the five Platonic solids.
From Greek 'dodeca-' (twelve) and 'hedron' (face or side). Named in ancient Greek geometry for its twelve-faced structure.
The dodecahedron is the only Platonic solid without mirror symmetry in some of its rotations—it's why medieval mathematicians found it almost mystical, and why it still fascinates physicists studying symmetry.
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