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This is an image from a match in the recently concluded Copa America football tournament. You see the referee holding something. This is a recent innovation that has been used in South American football for the last couple of years and was introduced to such an international tournament for the first time.

It was invented by the Argentinian player-turned-businessman Pablo Silva who has a company called "9.15 Fair Play Limit" that produces it. Some reports claim that since its introduction, the number of goals in matches has gone up.

What does the referee usually use it for?

Image: Yahoo! and Getty Images

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