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The Pin is visible sticking out of the Hole.

The Pin, also known as the Flagpole, is a feature found in the Mario Golf series. The Pin marks the location of the Hole, and the Flag is used to make it stand out a little more. Whenever the ball hits the pin, that would be called a "Pin Shot", usually making balls bounce back. The Pin is removed when players make shots on the Green, so that the ball can enter the hole much easier.