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Mule A Roman coin that is a hybrid, meaning it has the obverse of one emperor and the reverse of another. Coins of this type are generally scarce or rare. A modern day comparison would be the obverse (heads) of a US Penny and the reverse (tails) of a US Dime.	Mule A Roman coin that is a hybrid, meaning it has the obverse of one emperor and the reverse of another. Coins of this type are generally scarce or rare. A modern day comparison would be the obverse (heads) of a US Penny and the reverse (tails) of a US Dime.