<p>Everyone knows about pi, the world’s most famous irrational number. And just as recognizable is the pi symbol: . But how did that symbol come to be?</p>

Everyone knows about pi, the world’s most famous irrational number. And just as recognizable is the pi symbol: . But how did that symbol come to be?

Pi Day reveals origins of pi symbol

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Pi Day reveals origins of pi symbol

Pi Day reveals origins of pi symbol

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