Question about abbreviation you use

In classical five element acupuncture the “CF” stands for causative factor - similar to “root diagnosis” in TCM. It is generally introduced here - Foundations of Classical (Worsley) Five Element Acupuncture | Chinese Medicine Theory - Yin Yang House

From that page : " The diagnostic foundation of classical five element acupuncture is the theory of the causative factor or CF. The CF is thought to be the root cause for most of a patients presenting symptoms. It is thought that through birth or early childhood a constitutional weakness develops in one of the elements. Over time, this weakness has an effect on the other elements through the Sheng (mother-child) cycle. The CF is the element which is the foundation for the imbalances a person may experience and becomes the focal point of the treatment."