Worth underlining that designers work very hard to understand the needs of the particular situation. Usually type designers consider the legibility of 3, 6, 8,

Worth underlining that designers work very hard to understand the needs of the particular situation. Usually type designers consider the legibility of 3, 6, 8, 9, 0 (particularly 8 and 0) to be more important than between O and 0. But for coders, the ambiguity between O and 0 is a big problem, so a designer would consider that. An example for pilots: you are heading 180 and radio it as "one zero eight". Even if you immediately correct yourself, it's a problem.