Yet even after mathematicians worked out how to calculate pi accurately to over 100 decimal places at the start of the 18th century, we didn’t have an agreed symbol for the number. Math Pi-oneer ...

Not to worry, on Pi Day each store will have 300 mini apple-berry crumb pies ($3.50) and 150 whole pies in many flavors ($22.99) with the pi symbol. All are expected to sell.

Math aficionados can probably rattle off the value of pi down to several decimal places, but for most people, it's shorthand and approximate value is 3.14.

One pi calculation reigned for nearly 1,000 years Zu Chongzhi was a mathematician and astronomer in China in the 5th century. He cracked the pi code, nailing it down to seven sweet decimals ...

This may be the biggest legal controversy to engulf the mathematical constant pi since that time in 1897 when the Indiana legislature tried to declare it equal to 3.2: A Brooklyn artist is ...

Life & Culture Happy Pi Day! Celebrate the mathematical mystery with the edible one Updated: Mar. 13, 2015, 7:15 p.m. | Published: Mar. 13, 2015, 6:15 p.m.

He wants the whole pi. An entrepreneurial Brooklyn artist has trademarked the ancient Greek mathematical symbol — adding a period to the end — to brand his line of T-shirts, tank tops and hats.