I can't speak for Marie since I haven't read her manual for a few years. Nonetheless, NW would be associated with both heaven, patriarchal positions and money. I believe Marie prefers the first two interpretations for the NW. In more traditional Feng Shui, it would be associated with bankers, astrologers, leaders, business owners, investments and so on.
Doubtless someone else will provide you with the exact information you desire, but hopefully this satisfies your initial curiosity!