What does this symbol mean?

Generally speaking, a symbol means a "special memorial", just like a nickname is a name, which is convenient for people to remember and identify. It may be troublesome for you to remember Zhang Lisan, but it is much more convenient to remember "big beard" and "small glasses", so symbols can also be said to be caused by people's cognitive habits.

It means that an object represents another thing or idea and becomes a symbol of the represented thing in a meaningful form. This symbol form includes language, words or graphics. The idea that the symbol itself has a meaningful expression.

/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.