Good question on that, and delving into those topics is yet another dimension in the study of these weapons. I would suggest good references on African crafts and textiles with focus on West Africa. These patterns often contain important tribal symbolism and even colors have key meanings in many cases.
A great book which deals a lot in the symbolisms in African material culture, though focused on jewelry, is "Africa Adorned" by Angela Fisher. It is a huge volume but fantastically photographed and lots of fascinating detail on tribes and their traditional styles and effects .
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