“There is a close and beautiful connection between the transformation theory for elliptic integrals and the very rapid approximation of pi. This connection was first made explicit by Ramanujan in his 1914 paper " Modular Equations and Approximations to π " ....”
— Jonathan M. Borwein, Peter B. Borwein, and David H. Bailey, "Ramanujan, modular equations, and approximations to pi or how to compute one billion digits of pi." The American Mathematical Monthly 96, no. 3 (1989): 201–219.
“We all know that π = 3.14159 and little kids can sometimes give it out to hundreds of decimal places. But the stock market is not like that. There's a range of reasonableness ...”
— Warren Buffett, (quote at 7:46 of 38:17)
“Something's going on. It has to do with that number. There's an answer in that number.”
— Maximillian Cohen, in π (1998), written by Darren Aronofsky, Sean Gullette, and Eric Watson

Quotes via Wikiquote (CC BY-SA), each with its original source.

Pi was a Zhou dynasty (1045–256 BC) vassal state in ancient China. Also known as Xue, Pi was ruled by members of the Ren (任) family.

Overview

Pi was a Zhou dynasty (1045–256 BC) vassal state in ancient China. Also known as Xue, Pi was ruled by members of the Ren (任) family. Its progenitor Xi Zhong (奚仲), had been the Minister of Chariots (车正) for Yu the Great during the Xia Dynasty (~2070–1600 BCE) who was given land at the confluence of the Dan (丹水) and Yi Rivers (沂水) in the southern part of modern-day Shandong Province. During the Western Zhou Dynasty (1046–771 BCE), the State of Pi shares a border with the State of Song to the east and the State of Tan (郯国) to the north. History

From Wikipedia (CC BY-SA 4.0).