/kloc-in the 6th century, the French mathematician Viette used "=" to indicate the difference between two quantities. However, Calder, a professor of mathematics and rhetoric at Oxford University in England, thinks that it is most appropriate to use two parallel and equal straight lines to indicate that two numbers are equal, so the equal sign "=" has been used since 1540. 159 1 year, the French mathematician Veda used this symbol in a large number of diamonds, and it was gradually accepted by people.

Symbol is a symbol used by people to refer to an object, which can include all phenomena that express meaning through feeling in any form. In these phenomena, what can be felt is the embodiment of the object and its meaning.

For example, "=" is an equivalent symbol in mathematics, the Forbidden City is a symbol of ancient imperial power in China, China is a symbol of People's Republic of China (PRC), and the Bolsheviks are a symbol of * * * producers. It has two meanings:

On the one hand, it is the carrier of meaning and the presentation of spiritual externalization; On the other hand, it has an objective form that can be perceived.

In symbols, there are both sensory substances and spiritual meanings, which are unified and inseparable. For example, traffic lights at intersections are not intended to illuminate people, but represent a traffic rule. The connection between this symbol and the reflected object is realized through meaning. Symbols are always meaningful symbols, and meaning is always expressed in a certain symbolic form.