First ever white card shown in soccer: what does it mean? - AS USA

We're used to yellow and red cards but now a new option is being trialled in Portugal with a very different meaning.

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What is a white card in soccer?

What is a white card in soccer?

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Referee shows first white card in soccer history: What does it mean and when is it shown?

White card in football: All you need to know - The Economic Times

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Referee shows a white card for the first time in football history: But why?