Pathfinders use the old Mayan script to communicate out in the wild. In particular they use it in order to warn other pathfinders of the conditions of a certain area/city.E.g. Sun means that the village/settlement is friendly towards pathfinders, willing to offer shelters, and no need to hide their identity as pathfinders.
Mayan Mathematics - The Mayans had one of the most advanced number systems in the world at its time. It was a base-20 system (kind of) that also relied quite heavily on the number five. Some think that this is due to five fingers and five toes on each hand and foot. Their system relied on three different symbols. A “pebble” (small black circle) was used to represent the ones place. Learn more: https://3010tangents.wordpress.com/2015/02/25/mayan-mathematics/