For GNU ls: e/E, j/J, V, K, M, O, P, W, y/Y and z are not used
It uses all the other upper and lower case letters, along with digit 1 and has a hand full of long options without a corresponding short one.
Edit: I double-checked the man page, I'm surprised how many are unused, I would have guessed that it uses all of them by now.
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For GNU ls: e/E, j/J, V, K, M, O, P, W, y/Y and z are not used
It uses all the other upper and lower case letters, along with digit 1 and has a hand full of long options without a corresponding short one.
Edit: I double-checked the man page, I'm surprised how many are unused, I would have guessed that it uses all of them by now.