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
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An AE Triobol struck 246-222 BC in Alexandria
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

Diameter: 34 mm
Die Orientation: 11 H
Weight: 35.59 g
No notes for this coin
CPE B396; Svoronos 965; SNG Copenhagen 173-5
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An AE Hemidrachm struck 221-204 BC in Alexandria
Obverse: Diademed head of Zeus-Ammon right

Reverse: Eagle standing left on thunderbolt; cornucopia to the left; ΠTOΛEMAIOY_ΒAΣIΛEΩΣ, ΔI

Diameter: -
Die Orientation: -
Weight: 36.6 g
No notes for this coin
Svoronos 1127; SNG Cop 202; Noeske 145; BMC Ptolemies p. 57, 109 - 110; Weiser 50 (Ptolemy II, 253 - 249 B.C.)
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An AE Hemidrachm struck 222-205/4 BC in Alexandria
Obverse: Head of Zevs Ammon

Reverse: Eagle on thunderbolt

Diameter: -
Die Orientation: -
Weight: 32.15 g
No notes for this coin
Svoronos 1128; Weiser 52
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An AE Hemidrachm | Triobol struck c. 219 BC in Alexandria
Obverse: Diademed and horned head of Zeus-Ammon right

Reverse: ΠΤΟΛΕMAIOY ΒΑΣΙΛΕΩΣ, eagle standing left on thunderbolt; filleted cornucopia to left, ΔI between legs

Diameter: 34 mm
Die Orientation: 11 H
Weight: 36.46 g
No notes for this coin
CPE B496; Svoronos 1127
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An AE Hemidrachm | Triobol struck 163-145 BC in Cyrene
Obverse: Diademed head of Zeus-Ammon right

Reverse: BAΣIΛEΩΣ ΠTOΛEMAIOY EYEPΓETOY, eagle standing right on thunderbolt, wings spread; Φ to right

Diameter: 44 mm
Die Orientation: 11 H
Weight: 38.36 g
No notes for this coin
SNG Copenhagen 651; Svoronos 1641