Horizontal line 8 is a special mathematical symbol, which is called infinite symbol or infinite symbol. Its shape is similar to a horizontal number 8, which is used to represent the concept of infinity or infinity. ∞ symbol is often used in mathematics, physics, engineering and other fields, indicating that some values or variables have no upper or lower limit, infinity or infinity.
Application in mathematics: Infinite symbols are widely used in mathematics. For example, in the limit theory, when the variable tends to infinity, the limit can be expressed as infinity with the ∞ symbol. In set theory, the ∞ symbol can also be used to indicate that the number of elements in a set is infinite. Applications in physics and engineering: Infinite symbols also have important applications in physics and engineering. In physics, it can be used to represent the infinite value of some physical quantities, such as the infinite speed of light or the electric field intensity at infinity. In engineering, the ∞ symbol can be used to indicate that the capacity or performance of the system is infinite.