I have often read "None of the above" at the end of multiple-choice questions (and I guess this is shorthand for "None of the above items").
Recently, in answering a help center email with my answer on top of the help center’s suggestions, I wrote "none of the below helps me". It struck me as incorrect just after having send it. I guess I should have put "None of the items below".
But it seems to me it is a matter of usage rather than logic : if "the above" is OK, what’s wrong with "the below" ?