'O' instead of '0'
Back home in NZ, zeros on car number plates are printed "Ø", with the part of the slash in the centre of the number being omitted so that there is just the tip of the slash projecting from the top right and the bottom left. This makes it impossible to confuse the letter "O" from a "0".
Here in Germany the letter "O" on car number plates is "wider" or "rounder" than the figure "0".
I find the Kiwi method slightly clearer.