And yet the computer / mobile device you are using wouldn't work without a gazoober (or is that gaz00ber?) of zeros! And then what about imaginary numbers? Egad! Or irrational ones? Oh no! Or complex ones? Or quaternions? Or octonions?

For me (getting back on track), I've never understood why PNRs use the full character set. To eliminate potential ambiguities, one would expect they use only one of 0/O, 1/I/L, J/G (many non-native English speakers get those confused), V/W (again, can be confused in other languages), etc.