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A '''coin''' is a unit of [[currency]] which has the approximate value of the metal it contains. Coins of copper or bronze have less value than those of silver or gold.
Generally a coin is stamped with the face of a nation's ruler, while the reverse has some official insignia.
Coins are often used to decide who goes first in games like [[American football]].
The front of a coin is called "heads" and the revers "tails" when flipping a coin.