[killermonkeys]

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.