A dodecahedron (pronounced "do-dee-kah-dron") is a 3D shape that looks like a ball of spikes, but is actually a 3D analogue of a 5-regular graph.
Imagine a shape with 12 pentagonal faces and 30 edges. Now, stop imagining that because it's hard, and just take my word for it.
A dodecahedron is like the party animal of the polyhedron world. It's always pent-up for fun, and never gets tired of its 5-sided antics.
But wait, there's more! A dodecahedron has a lot of symmetry, just like your aunt at a ball. Learn more about dodecahedron symmetry
What is a Tesseract? (It's like a dodecahedron's cousin, but with more dimensions)