Er: Pictographic. Oracle Bone Inscriptions glyph, below is the word "people", which looks like a child crying and laughing. "Er" is one of the radicals of Chinese characters, and the characters from "er" are mostly related to "people". Original meaning: children. In ancient times, men were called children, and women were called babies. Later, children were called children.

Son: Pictographic. Oracle Bone Inscriptions-shaped, like a baby in its infancy, has a head, a body and arms, and its feet are like being together. Zi is a radical of Chinese characters. The original meaning is: baby.

In ancient times, it refers to children, but now it refers to men among children.

Appellation is: a man calls himself to his parents or his parents call himself a male child.