The Hemilitron denomination
The Hemilitron was an ancient Greek denomination in the Sicilian Litra system corresponding to half a Litra - or six onkia.

The Hemilitron was struck in both bronze and silver, and is characterized by six pellets on the reverse design.
Hemilitron

(1) Hieron II 230-218/5 BC
Obverse: Diademed head left
Reverse: Warrior on horse prancing right, holding couched lance; ΣΛ below
Ref: CNS 195; cf. SNG ANS 956
(2) Himera 420-409 BC
Obverse: head of nymph left; •••••• / IM_E
Reverse: wreath, 6 • inside
Ref: SNG Cop 320; Calciati I p. 43, 35; ...
(3) Syracuse 410-405 BC
Obverse: Head of Arethusa left, wearing necklace
Reverse: Star of (8 or 16) rays in circular incuse within quadripartite incuse square
Ref: SNG ANS 398-402 or SNG ANS 394-7 va...
(4) Syracuse | Agathocles 317-289 BC
Obverse: Head of Kore left wreathed with grain, amthora ?; ΣΥΡAKOΣIΩN
Reverse: Bull butting left, dolphin above and below; (NK)
Ref: cf. Calciati II p. 218, 96 DS 114 R...