The mathematical symbol of greater than or equal to is ≥. When one value is greater than another value or two numbers are equal, it is represented by the symbol ≥, which is also called not less than. The mathematical symbol less than or equal to is ≤. When one numerical value is less than another numerical value or two numerical values are equal, the less than or equal sign is used, which is also called not greater than.

In 1655, Wallis means equal to or greater than; in 1670, he means equal to or greater than and equal to or less than, respectively. According to a letter Goldbach wrote to Euler in June 1734, _ and _ were first adopted by a Frenchman, P. Bouguet (1698-1758), and then gradually became popular. Poincare and Borel introduced the symbol > > in 190 1. (much greater than), it was quickly accepted by the mathematical community and is still in use today.