The regular solid
A regular dodecahedron has twelve pentagonal faces, thirty edges, and twenty vertices. Its face and dihedral angles follow from geometry. Exact formulae make it a good calculator subject.
The Roman objects
Roman dodecahedra are hollow copper-alloy artefacts with apertures and corner knobs. They vary in size and no surviving Roman text securely explains their purpose. English Heritage and museum records therefore describe an unresolved archaeological category, not a solved instrument.
Symbolism and use
The dodecahedron acquired cosmic associations in Platonic traditions, making symbolic readings historically relevant to reception. That does not prove a particular excavated object functioned as a cosmological device. The tool calculates shape; the essay labels use theories as theories.
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