Its original meaning is knot. In the era of knotting notes, a rope is knotted one by one to show a certain meaning. When observing the change of the sun shadow with the original corona, eight ropes were used, each rope was divided into three sections with knots in them.
Eight ropes were used, so Bagua Palm was once called "Bagua Palm". Eight ropes are connected in a row, from "Eight Hanging" to "Eight Diagrams", and three ropes form three hexagrams, representing three elements of an observation record.
"Yao" and "Yao" are homophonic and can be understood as "elements". Zhou Wenwang doesn't necessarily use ropes to express Yi, but he may use fingers or palm parts to express the three yin and yang information of hexagrams.
Extended data
Since the creation of Yi by Fuxi in ancient times, the symbolic expression of Yi has also gone through an evolutionary process and has different forms of expression. Today's symbols are the result of evolution. From the perspective of time and space, he is also a basic expression of the state of time and space and the foothold of Fuxi's basic logic.
It represents the overall function of yin and yang interweaving. For the earth, it refers to the interweaving effect of the movements of the sun and the moon on the earth, which means "functional interweaving".
Its basic symbol uses "-"to intuitively indicate the positive effect of the sun, and uses "-"to intuitively indicate the effect of the moon reflecting the sun on the earth and the effect of the moon itself on the earth, that is, two "-"indicate the negative effect.
In this way, two characteristics are formed, which are represented by "-"and "-"respectively in Fuxi Yi, belonging to yin and yang, and are called "-"as yang and "-"as yin respectively. This is also the basic symbol to express yin and yang.
Baidu encyclopedia-Yao