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Different sided dice are designated with a D and then the number of sides - so a die with 6 sides is a D6, for example.
There are five shapes (called the Platonic Solids) that work well for dice. One of those shapes is the dodecahedron, with 12 sides.
With one dozen sides
Each one pentagonal
When you subdivide
Back in ancient Greece
Now everyone knows pyramids and prisms are nice
Forget about those 'cause you know
That Platonic solids make the best dice
But just be aware
It's one polyhedral
Of many out there
A dodecahedron D-12