Pi is constant, it is represented by the Greek letter π. The numerical value of π is 3.1415926…

Pi is infinite series irrational number.

From wikipedia:
Piphilology is the practice of memorizing large numbers of digits of π, and world-records are kept by the Guinness World Records. The record for memorizing digits of π, certified by Guinness World Records, is 70,000 digits, recited in India by Rajveer Meena in 9 hours and 27 minutes on 21 March 2015.

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