Left and right are the paths of yin and yang, and the Yellow Emperor's Classic of Internal Medicine also mentions that "yang rises from the left, and yin descends from the right," which means that yang is on the left and yin is on the right. The male is the yang and the female is the yin. Hence the term "male left, female right". In general, our left hand is also warmer than our right hand. This also reflects the fact that Yang is on the left and Yin is on the right. There is another phenomenon that coincides with left ascending and right descending: on a clock, the hands run in the left ascending and right descending direction, which is often referred to as the "clockwise direction".

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