The Quadrans denomination
The quadrans (literally meaning "a quarter") or teruncius ("three unciae") was a low-value Roman bronze coin worth one quarter of an as.

The quadrans was issued from the beginning of cast bronze coins during the Roman Republic with three pellets representing three unciae as a mark of value.

The obverse type, after some early variations, featured the bust of Hercules, while the reverse featured the prow of a galley. Coins with the same value were issued from other cities in Central Italy, using a cast process.
Quadrans

(1) Anonymous After 211 BC
Obverse: Head of Hercules right, wearing lion's skin headdress; behind, three pellets.
Reverse: Prow of galley right, ROMA above, three pellets below.
Ref: Crawford 56/5
(2) C. Numitorius 136? (133)BC
Obverse: head of Hercules right wearing lion skin, club below ●●●
Reverse: prow of galley right ●●● C·NVMITRI ROMA
Ref: Crawford 246/4a
Obverse: Head of Hercules right, wearing lion’s skin; behind, three pellets and below neck truncation club.
Reverse: Prow right; before, three pellets, above M·ABVRI MF / GEM, and below, ROMA.
Ref: Crawford 250/2, Sydenham 488, Aburi...
(4) Rome | Anonymous 225-217 BC
Obverse: head of Hercules left wearing lion's skin ●●●
Reverse: prow of galley right ●●●
Ref: Crawford 35/4; Thurlow & Vecchi 54;...
(5) Rome | Anonymous 211-206 BC
AE Quadrans Sardinia?
Obverse: head of Hercules right wearing lion skin; ●●●
Reverse: prow of galley right ROMA; ●●●
Ref: Crawford cf. 56/5; RBW 210. Cf.; Mc...