Hello John, and welcome to the guild. You pose an interesting question but I think I would need a bit more clarity before I could even attempt an answer.

First of all is the map rotated clockwise or anticlockwise. Second, was North straight up before the map was rotated. Third, are we rotating the map and the projection on it or are you rotating the border and keeping the projection stationary such that when you realign the map the projection has to be rotated with it.

At first stab at an answer though I would say the representation of North is whatever the grid or the compass says it is.

Can I ask a question in return... why are you asking about a map being rotated at all ? Is this some kind of conundrum or test or a split of opinion on the topic that needs resolving ?