In the novel "Contact" by Carl Sagan there is a hidden message encoded in PI in base 11:

She find a long string of 1's and 0's late in the expansion of Pi in base 11. It's length is a product of two primes, indicating a two dimensional array. So, she plots it on her computer screen (each digit representing a pixel) and sees a perfect circle. The constant which describes the ratio of a circle's circumference to its diameter itself contains a picture of a circle!

I heard that Tau is superior to Pi (tau = 2 PI)

https://en.wikipedia.org/wiki/Turn_(...#Tau_proposals
Then I thought the base should be base 36:

https://en.wikipedia.org/wiki/Senary...ry_compression
(Math.PI*2).toString(36) [in the javascript console]

= 6.a70akmheav

hmmmm kind of interesting... I'll see if I can get more characters

https://pythonhosted.org/bigfloat/
"...arbitrary-precision floating-point reliable arithmetic...."