The multiplication symbol "×" was first used by the British mathematician Audley in the17th century. He wrote the plus sign obliquely, indicating another operation method of increasing numbers, and named him "multiplication sign".

Multiplication is one of the earliest operations, which appeared in the earliest written records of human beings. 163 1 year, Oughtred, a British mathematician, used "x" to represent the multiplication of two numbers for the first time in his book clavis mathematicae, which is a modern multiplication symbol and has become more and more popular since then. In the letter 1698 to J. Bernoulli on July 29th, Leibniz proposed to use "x" to indicate multiplication, in case the "x" was confused with the letter X. Later, it was quite popular to use "x" to indicate multiplication. At present, schools in continental Europe (Germany, France, the Soviet Union and other countries) all stipulate ""as the multiplication sign. Other countries use "×" as multiplication sign and "×" as decimal point. Our country stipulates that "×" or "×" can be used as a multiplication sign, and the multiplication sign before letters or brackets can be omitted.

English: Numbers hidden in punctuation marks are used to replace inconvenient words.

Mathematics: the multiplication sign in four operations, used for operation.