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The term for grooves on a coin's edge is reeding.

Reeding was introduced to stop the practice of "shaving" coins back when they contained silver or gold. Crooks would use a knife or file to remove small amounts of metal from the edges of a lot of coins and then sell the shavings at a profit. If the edge is smooth it is much harder to detect shaving, so reeds were put on the edges to make it more obvious when someone had tampered with a coin.

Today reeding isn't needed to prevent shaving, but it has become useful as a way for people who are blind to tell the difference between coins with similar diameters. For example, dimes and cents are almost alike in size but cents have smooth edges; same thing for quarters and dollars. Regarding euro, which has 8 regularly-circulating coins, unusual patterns are used to distinguish among coins that are otherwise essentially the same size. 50-eurocent coins have coarse reeding, €2 coins have fine reeding and €1 coins have "interrupted" reeding; i.e. there are alternate patterns of smooth and grooved sections along the edge.

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17y ago

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