Bi-metallic coin

[1] Common circulating examples include the €1, €2, United Kingdom £1 and £2, Canadian $2, South Africa R5, Egyptian £1, Turkish 1 lira and 50 kurus, Indian ₹10 and ₹20, Indonesian Rp1,000, Polish 2 and 5 zł, Czech 50 Kč, Hungarian 100 and 200 Ft, Bulgarian 1 and 2 lv., Hong Kong $10, Argentine $1 and $2, Brazilian R$1, Chilean $100 and $500, Colombian $500 and $1000, Peruvian S/2 and S/5, Albanian 100 Lekë, Thai 10 baht and all Mexican coins of $1 or higher denomination.

The Roman Empire issued special-occasion, large medallions with a center of bronze or copper and an outer ring of orichalcum, starting with the reign of Hadrian.

[4][5] Though not legal tender, Moore's tokens were circulated widely and accepted at face value by many merchants.

Despite their popularity, the Royal Mint rejected the proposal, and did not reduce the size of the penny and halfpenny until decimalization.

For example, the only bi-metallic coin issued by the United States is the $10 Library of Congress commemorative, made of a gold ring around a platinum center.

Bi-metallic coins are made up of a core with an outer ring. (e.g.: 500 yen coin )
A Brazilian R$ 1 coin with its parts separated
Countries with bimetallic coins in circulation. Gold denotes more than one bimetallic coin in use. Red denotes one bimetallic coin in use. Blue denotes that non-bimetallic coin of the same value circulates alongside the bimetallic coin.