One of the 16 directions, specified with a string.
"north" | "north_north_east" | "north_east" | "east_north_east" | "east" | "east_south_east" | "south_east" | "south_south_east" | "south" | "south_south_west" | "south_west" | "west_south_west" | "west" | "west_north_west" | "north_west" | "north_north_west"