Every once in a while it is worth some useless comment. Today, 3-14-15 is Pi day, yes the pi related to the circle. Like 2 pi r, etc.
The Guardian has a great historical piece:
The symbol π was popularised in 1737 by the Swiss mathematician
Leonhard Euler (1707–83), but it wasn’t until as late as 1934 that the
symbol was adopted universally. By now, π is instantly recognised by
school pupils worldwide, but few know that its history can be traced
back to a small village in the heart of Anglesey. William Jones was born in 1674 on a small holding close to the
village of Capel Coch in the parish of Llanfihangel Tre’r Beirdd, north
of the county town of Llangefni in the middle of the island.
So we can thank these fellows for choosing pi rather than some other symbol for the ratio of the circumference and radius of a circle.
We I guess can thank them for pi day!
Oh yes,
pi = 3.1415......
That is whay today is pi day, unless you are in Europe and they switch day and month so today is 14-3-15......so much for pi day.