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 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 ...
(2) Ptolemy IV 222-205/4 BC
Obverse: Head of Zevs Ammon
Reverse: Eagle on thunderbolt
Ref: Svoronos 1128; Weiser 52