Signs and symbols are a specific part of graphic arts, called iconography. Merriam-Webster defines iconography as:
Trails, just like any other infrastructure conveying human beings, need signage of some kind to help direct users and get them to be aware of various realities on the trail. But bad signage can be as bad (or worse sometimes) then no signage.
So how can a trail system do trail signage right? What can help direct users without overloading them?
Write something about yourself. No need to be fancy, just an overview.