One of the names of the meridian. It is the final stage of the development of yin qi, where the process of transformation back towards the yang aspect begins. This is the significance of the name "margence of double yin" (Suwen-Zhizhenyao Da Lun). Its location is inside the taiyin and shaoyin, hence it is also referred to as "jueyin as the closing" (Suwen-Yinyang Lihe Lun), see "opening, closing, pivot").