What's the wisdom line (purple) as shown in figure, the hands which line is wisdom?

Line: wisdom is western palmistry name, in Chinese palmistry called "grain", is one of the three main human palm, located in the central, palms up the edge of the third joint cavity on the index finger, to the hypothenar is parabola, reaching the middle finger, ring finger or little finger beneath.Wisdom line can not only can know the height, at the same time also can perform reasoning power and force towards the pros and cons of brain activity.