New bronze coins, multiples of the "nummus" were introduced, such as the 40 "nummi" (also known as the "follis"), 20 "nummi" (also known as the "semifollis"), 10 "nummi" (also known as the "decanummium", and 5 "nummi" coins (also known as the "pentanummium"); other denominations were occasionally produced. The obverse (front) of these coins featured a highly stylized portrait of the emperor while the reverse (back) featured the value of the denomination represented according to the Greek numbering system (M=40, Λ=30, K=20, I=10, E=5). Silver coins were rarely produced.