A sign means a sign or thing that indicates characteristics; Indicate a certain characteristic.

Li Daoyuan's Notes on Water Classics and Notes on Water in the Northern Wei Dynasty: "There was a stone inscription in front of it, which was set up at the end of the Han Dynasty by a high order. There was nothing to say, but it was just a sign."

the origin of the logo can be traced back to the "totem" in ancient times. At that time, every clan and tribe chose an animal or natural image that they thought had a special mysterious relationship with themselves as a special symbol of their clan or tribe (that is, totem).

For example, Nuwa clan takes snakes as totems, Xia Yu's ancestors take yellow bears as totems, and others take the sun, moon and crow as totems. At first, people carved totems on caves and labor tools where they lived, and later they became national flags and emblems as symbols of war and sacrifice. After the country was born, it evolved into a national flag and national emblem.

In production, labor and social life, people in ancient times constantly created and widely used various kinds of signs, such as road signs, village signs, steles, seals and heralds, in order to facilitate contact, mark meaning and distinguish the characteristics and ownership of things. Broadly speaking, these are signs. In the tombs of ancient Egypt, vessels with logo patterns were found, mostly the manufacturer's logo and name, and later changed into patterns.

in ancient Greece, signs were widely used. Ancient buildings in Rome and Pompeii, as well as in Palestine, have been found engraved with masons' special signs, such as crescent wheels, grape leaves and similar simple patterns. China has its own workshops and shops, accompanied by signs, covers and other signs. There are dark marks in the paper made in the Tang Dynasty.

by the song dynasty, the use of trademarks had become quite common. For example, at that time, Liu Jiazhen Shop, which specializes in making fine needles in Jinan, printed the rabbit's figure and the trademark of "recognizing the white rabbit in front of the door as a memory" on the commodity packaging. The armor worn by soldiers in Europe in the Middle Ages had invisible marks on their skulls, and aristocratic families also had family emblems.