The Nomos denomination
The Nomos was an ancient Greek silver denomination weighing approximately 8 grammes.

It was roughly equivalent to the Attic didrachm or the Achaean stater, and is most often used about coins struck in Magna Graecia, especially Italy.
(1) Taras
An AR Nomos struck 280-272 BC in Taras
Obverse: Nude youth crowning himself on horse standing right; capitol of Ionic column below; IΩ / IAΛO

Reverse: Taras seated on dolphin left, holding akrostolion and spindle; ANϘ / TAPAΣ

Diameter: 20.5 mm
Die Orientation: -
Weight: 6.31 g
No notes for this coin
HN Italy 1014, Vlasto 803 ff.; SNG ANS 1142 ff., SGCV I 363 var.
(2) Tarentum
An AR Nomos struck 281 - 272 BC in Tarentum
Obverse: Nude warrior on horseback left, carrying small round shield

Reverse: Taras seated on dolphin left, holding Nike in right hand; waves below.

Diameter: -
Die Orientation: -
Weight: 7.82 g
No notes for this coin
Vlasto 684-686; SNG ANS 1060
(3) Tarentum
An AR Nomos struck c. 302-280 BC in Tarentum
Obverse: Nude rider on horse, holding shield and two spears with left hand, Greek text to upper left (ΦΙΛΩΝ) and lower left (ΕY)

Reverse: Phalanthos, nude, riding dolphin above waves, Nike in right hand, crowning with wreath of laurels, left hand resting on dolphin, Greek text to the upper right (TAPAΣ)

Diameter: 23 mm
Die Orientation: -
Weight: 7.81 g
This particular issue was minted in the years prior to Tarentum's final deafeat by Rome in 272 BC. The depiction of Nike crowning Phalanthos likely celebrates a military victory in the ongoing struggle against Rome. Phalanthos was a hero of Greek mythology, leader of the Spartan Partheniae and the mythic founder of Tarentum.
Vlasto 683; SNG ANS 1059; Historia Numorum Italy 964
(4) Tarentum | Ari
An AR Nomos struck 332 - 302 BC in Tarentum
Obverse: Nude, helmeted warrior on horseback to right, holding spear in right hand and shield and two more spears in left hand; [Ξ] in left field, [API] below horse

Reverse: Taras astride dolphin to left, holding oar in left hand and a kantharos in outstretched right hand, KΛ below dolphin, [TAPAΣ] to right.

Diameter: 21 mm
Die Orientation: -
Weight: 7.12 g
Calabria, Tarentum
HN Italy 939; Vlasto 636
(5) Thourioi
An AR Nomos struck c. 400-350 BC in Thourioi
Obverse: head of Athena right wearing crested Attic helmet decorated with Skylla; E

Reverse: bull butting right; fish swimming right below; ΘOYPIΩN

Diameter: -
Die Orientation: -
Weight: 7.65 g
No notes for this coin
HN Italy 1783; cf. SNG ANS 1015
(6) Velia
An AR Nomos struck 334-300 BC in Velia
Obverse: Head of Athena left, wearing a crested Phrygian helmet decorated with a Centaur

Reverse: (KE) monogram of Kleudoros Lion standing left devouring prey A / Φ YEΛHTΩN (unreadable)

Diameter: -
Die Orientation: -
Weight: 7.25 g
No notes for this coin
Williams 328 (O174/R244); HN Italy 1294; SNG ANS 1337