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 81-161 AD
Obverse: cuirassed and helmeted bust of Mars right
Reverse: cuirass; S__C
Ref: RIC II p. 218, 19
(2) Augustus 9 BC
Obverse: altar; III•VIR•A•A•A•F•F•
Reverse: cornucopiae; LAMIA SILIVS ANNIVS / S__C
Ref: RIC I 422
(3) Augustus 9 BC
Obverse: LAMIA SILIVS ANNIVS, Clasped hands holding caduceus
Reverse: III VIR AAAFF surrounding large SC
Ref: RIC I (Second Edition) Augustus 420
(4) Augustus 15-10 BC
Obverse: IMP CAESAR, Head of Augustus facing right, wearing laurel wreath
Reverse: AVGVSTVS, Eagle standing facing with wings spread, head to left
Ref: RIC I (Second Edition) Augustus 227...
(5) Claudius 41 AD
Obverse: modius; TI CLAVDIVS CAESAR AVG
Reverse: legend around S•C; PON M TR P IMP COS DES IT
Ref: RIC I 84, Cohen I 70, BMCRE I 179, ...
(6) Domitian 84-85 AD
Obverse: Rhinoceros left
Reverse: S C; IMP DOMIT AVG GERM
Ref: SRCV I 2835; RIC II-1 250; BMC 498
(7) Hadrian 121-122 AD
Obverse: IMP CAESAR TRAIAN HADRIANVS AVG, Eagle standing facing, head right
Reverse: P M TR P COS III, Winged thunderbolt; SC below
Ref: RIC II Hadrian 624