Celebrating Pi Day at Sal's Pizza in Boston 03:04. Today marks National Pi Day in the United States and around the world. The holiday commemorates a timeless symbol beloved by many in mathematical ...

Lam King-fui, 15, Carmel Bunnan Tong Memorial Secondary School: The math symbol in my family is the division sign (÷) . In my family, everyone has a role to play, but at the same time, we ...