Question about maps

Hi all! Not sure if I'm just being dense here but I'll ask anyway. I'm hoping to run a campaign of Fabula soon and have had a look at the world sheet. At the top, one of the fillable boxes is for "Map N." I'm confused what the N. means here? Name, number, north?

Again, sorry if this is a dumb question, but I'm confused on it and can't find anything to clarify.