Ordinary values, numerical values, such as x = 3, and this 3 is a numerical value; The value of the mean value theorem can be a numerical value or a function expression; Absolute value, which can be a numerical value, such as |-3| = 3, or an expression; The concept of "domain": for example, the value range of x is "domain"; The value range of y is the "value range"; The concept of "modulus", such as the concept of modulus and modulus value of vector; The concept of "amplitude angle and amplitude"; Extreme value, extreme value, minimum value and maximum value; The concept of "remainder, salvage value" may be a value or a function. Generally speaking, "value" mostly refers to "numerical value", a "number".