reverse
裏面 — Reading
The back of a coin, where value and mint are given.
Sovereign gold coin 2017 (in issue card, reverse)2017
Gold stater of Philip IICirca 336–328 BC
Alexander TetradrachmCirca 330–325 BC
While the obverse often indicates 'who', the reverse frequently indicates 'what' or 'where'. The full meaning of a coin is only understood when both sides are read together.