Chinese/Japanese proverb that literally means without an equal or enemy in the whole world and denotes a character being unrivaled and unmatched. Can be seen printed on clothing.

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無雙 (cn)
无双 (cn)
無双 (jp)
無敵 (cn/jp)
无敌 (cn)

Any of the above may be prefixed by 天下 (cn/jp)
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unrivaled