For interest, and not to muddy the waters too much, this is what is generally meant by the north and south of coils on a drawing.
However, the reason they are called 'North' and 'South' rather than the easier to understand, 'Top' and 'Bottom' is because (by general convention, but very occasionally not), the top pickup has the North side of the magnetic field to the strings, and the bottom of the pickup has the south side to the strings.
To definitvely find out which is which, hold a compass above the poles - if the N points to the pickup that is south to the strings, if the S points to the pickup, it is north to the strings.