Taiyi, also known as Taiyi number, is a magic number and the first of three types. ("Sanshi" is the three great arcane magic numbers in ancient China, namely Taiyi, Qimen and Liu Ren, also known as "Sanshi"), which is an advanced prediction in ancient times. It is said that Taiyi style was produced when the Yellow Emperor fought Chiyou. Five turtles in Qimen; "Yesterday, the Yellow Emperor ordered me to be Taiyi, Gong Lei or Jiugong, and I took the Luo Shu number", which was imitated by Yi Li and belonged to the Book of Changes. Its method is probably based on the Taiyi Jiugong method in Yi Gan Wei Chisel.