What the most unusual versioning did you hear?

For example:

Donald Knuth's legendary TeX typesetting system uses a version number that, as of version 3, converges to π by adding another digit at each release: 3.14159265…. This signifies how the system is getting closer to perfection. Similarly, the Metafont system converges to e: 2.7182818….

Comments

[José Pablo Ramírez Vargas]

Love it!