What does the symbol on the bottom of a WotC miniature mean?

Question

When I look on the bottom of the latest official D&D miniatures, there is some information about what product line a particular miniature came from. But there is also a small symbol below that, like a star or diamond.

I read some where what the symbol meant, but because I have a memory comparable to an Alzheimer's patient, I can't remember.

What do those symbols mean?

Answer 1

Miniature Rarity, Circle is common, Diamond is uncommon, Star is rare and Circle-Star is ultra-rare.