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The earliest known textually evidenced approximations of pi date from around 1900 BCE; they are 25/8 (Babylonia) and 256/81 (Egypt), both within 1% of the true value.

The Greek letter pi was first used to represent the ratio of the circumference of a circle to its diameter in 1709 by mathematician William Jones.
en.wikipedia.org/wiki/Pi

The number π is a mathematical constant, the ratio of a circle's circumference to
its diameter, ..... A photograph of the Greek letter

www.historytoday.com/patricia-rothman/william-jones-and-his-circle-man-who-invented-pi

In 1706 a little-known mathematics teacher named William Jones first used a
symbol to represent the platonic concept of

www.reference.com/history/invented-pi-5cc56400e24b573d

A mathematics teacher named William Jones is credited with first using the symbol π in 1706 to represent the concept of the ratio between a circle's ...

www.theguardian.com/science/alexs-adventures-in-numberland/2015/mar/14/pi-day-2015-william-jones-the-welshman-who-invented-pi

Mar 14, 2015

britton.disted.camosun.bc.ca/pi/piorigin/piorigin.html

But did you ever wonder where

www.scientificamerican.com/article/what-is-pi-and-how-did-it/

Succinctly,

www.quora.com/Mathematics-Who-discovered-pi

If you mean who introduced the symbol pi in the public it was Euler.The following
article though ... William Jones and his Circle: The Man

yousigma.com/interestingfacts/whoinventedpi.html

Aryabhattä gave an accurate approximation for

www.math.rutgers.edu/~cherlin/History/Papers2000/wilson.html

The History of