Where does Tian Zi come from in The Palm of the Saints?

Salvia purpurea According to legend, China Saint Wei Zi was born in the countryside. When he was born, he had a Tian Zi seal on his left hand. However, this Tian Zi seal is not an almost incomprehensible Oda character pieced together with common random patterns, but is mainly composed of the main pattern, with a square Tian Zi, which is bigger than the whole palm. Therefore, the saint holding Tian Zi came from the saint of China.