bezant

noun2

1. •
   A coin made of gold or silver, minted at Byzantium and used in currency throughout mediaeval Europe.
2. •
   A roundel or (that is, a golden circle), the heraldic representation of a gold coin.

   • One and All is the motto of the County of Cornwall, used below the coat-of-arms, which is a shield embracing fifteen bezants, or golden roundels, on a black ground; [...]. — 1941