You've probably noticed that of the four coins that are in wide circulation in the United States today, two, the dime and the quarter, have a series of ridges on the edge.

Why Do Some Coins Have Ridged Edges?

U.S. History

You've probably noticed that of the four coins that are in wide circulation in the United States today, two, the dime and the quarter, have a series of ridges on the edge. According to the U.S. Mint, this is technically referred to as a reeded edge. But is the reeded edge purely decorative, or does it serve a purpose?

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