Stop looking for those lost license plates
How many different types of license plates are there in the world? I'm not sure, but if you are ready to do a hand count, you could start at License Plates of the World. You will find a ridiculous amount of license plates; not just current ones, but past plates as well. There are also ways to purchase some of the plates, if you happen to be the type of person who is missing that 1930s vintage Montana plate.