Although the vast majority of coins are circular due to their origin as flattened pieces of metal forged between tongs, coins are made in a variety of other shapes, including squares, diamonds, hexagons, heptagons, octagons, decagons, and dodecagons. They have also been struck with scalloped (wavy) edges, and with holes in the middle.
Although the vast majority of coins are circular due to their origin as flattened pieces of metal forged between tongs, coins are made in a variety of other shapes, including squares, diamonds, hexagons, heptagons, octagons, decagons, and dodecagons. They have also been struck with scalloped (wavy) edges, and with holes in the middle.
Source: Wikipedia "Coinage shapes" · CC BY-SA 4.0
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