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Pi
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pi - "name for Greek symbol representing the ratio of the circumference of a circle to its diameter; approximately 3.1416" by AcronymsAndSlang.com
Saint Louis Science Center on Twitter: "What does pi mean to you? Come find out at SciFest: I Heart Pi this weekend and on #PiDay. Schedule: https://t.co/xT90Iv5bKd. #SciFestSTL https://t.co/phh3MTManQ" / Twitter
