The Hemidrachm denomination - Variants: Triobol
The Hemidrachm was an ancient Greek coin denomination with a value of 3 obols, which is half a drachm. it is also often called a triobol.

The hemidrachm generally weighs around 2.15 grams when struck in silver, but was also struck in bronze.
Hemidrachm|Triobol

(1) Ptolemy III 246-222 BC
Obverse: Diademed and horned head of Zeus-Ammon right
Reverse: ΠΤΟΛΕΜΑΙΟΥ ΒΑΣΙΛΕΩΣ, eagle standing left on thunderbolt, wings closed; XP monogram between legs, filleted cornucopiae in left field
Ref: Svoronos 965; SNG Copenhagen 173; S...
(2) Ptolemy IV 221-204 BC
Obverse: Diademed head of Zeus-Ammon right
Reverse: Eagle standing left on thunderbolt; cornucopia to the left; ΠTOΛEMAIOY_ΒAΣIΛEΩΣ, ΔI
Ref: Svoronos 1127; SNG Cop 202; Noeske ...
(3) Ptolemy IV 222-205/4 BC
Obverse: Head of Zevs Ammon
Reverse: Eagle on thunderbolt
Ref: Svoronos 1128; Weiser 52