The Siliqua denomination
The siliqua is the modern name given (without any ancient evidence) to small, thin, Roman silver coins produced in the 4th century A.D. and later.

When the coins were in circulation, the Latin word siliqua was a unit of weight defined as one twenty-fourth of the weight of a Roman solidus.
Siliqua

(1) Anonymous 530-580
Obverse: Helmeted, draped, cuirassed bust right,
Reverse: K
Ref: Vagi 3051; Bendall Type 8c