The kuna

The thing I learned today is that the unit of currency of Croatia is the kuna.  As of mid-2014, the kuna is worth about one-fifth of a dollar.  The word kuna means "marten" in Croatian!

Agio

Agio is a term used in commerce for exchange rate, discount or premium.  In the context of currency exchange, "agio" refers to the premium or fee that is charged when converting one currency into another.  For example, if a bond with a face value of $1,000 is sold for $1,050, the $50 difference is considered the "agios."

In 2010, the reverse of the U.S. one penny coin was changed from the Lincoln Memorial to a Union Shield with a scroll reading "one cent" superimposed on it.