tiān, a commonly used word in the first-level Chinese general specification, is pronounced as ti ā n. When referring to a pictographic character, it means knowing it. It was first seen in Oracle Bone Inscriptions, like a human figure standing on the front. It highlighted the original meaning of the word on the human head with a box, which also indicated the boundless sky above the human head and extended the sky.

The original meaning is the head of a person, and it also means the sky above the head of a person where the sun, moon and stars are located. The earliest interpretation of heaven in Chinese tradition.