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A U.S. penny, with "heads" shown on top, and "tails" beneath it.

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 reverse "tails" when flipping a coin.

In fiction

Video games

Coins are the main unit of currency in the Mario franchise. However, the mainline Super Mario games instead feature them as collectible items, and collecting 100 of them gives the player an extra life, or "chance," at the game. The same also applies to the Yoshi platforming games.