Teacher Zhou Yi manually calculated the Five Elements and Eight Characters to give professional names; Geng Yin--Xin Si--Geng Shen--Geng Chen
The Japanese Geng Metal was born in the place of immortality in the Si month, and the eight characters Jin Duo is stronger than Jie. ‘Strengthening metal with fire can make a vessel’.
The five elements make fire the god of the eight characters, and wood makes fire the god of joy. Water, metal and earth are taboos. . . . . .