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The number of coins produced from the ancient time until now is countless. If coin design has a simple problem, it can cause great inconvenience to society. According to the shape of the finger tip or a difficult angle, it can be difficult to pick up the coin that fell on the floor. When a user pushes a coin with his thumb based on the principle of a lever, there appears a space with about an eight-degree angle through its outside incline. It is easy to pick the coin up using the space generated. This shows that this coin design paid attention to even a users trivial inconvenience.