TeX uses the digits of Pi for its versioning
Since version 3, TeX has used an idiosyncratic version numbering system, where updates have been indicated by adding an extra digit at the end of the decimal, so that the version number asymptotically approaches Pi.
The current version is 3.141592
Likewise, versions of METAFONT after 2.0 asymptotically approach e.
-- (February 22, 2007) on Pi
I could not see a reference to PI the movie
Here is a link to it
A paranoid mathematician searches for a key number that will unlock the universal patterns found in nature.
A rather odd movie, but somewhat captivating.
Essential to a collector of all things PI,
-- (January 14, 2007) on Pi