Coat of arms of Serbia and Montenegro

The coat of arms of Serbia and Montenegro consisted of a shield with the Serbian eagle (a white double-headed eagle adopted from the Nemanjić dynasty) and the shield with a quartering the Serbian cross (or cross with firesteels) and the Montenegrin lion of Saint Mark (a lion passant adopted from the Republic of Venice). This emblem had served as the national symbol of the State Union of Serbia and Montenegro (known as the Federal Republic of Yugoslavia until 2003).

Source: Wikipedia — Coat of arms of Serbia and Montenegro (CC BY-SA 4.0)