The most basic definition of power is: let a be a certain number and n be a positive integer. The n power of a is an, which represents the result of multiplication of n A's, such as 24 = 2x2x2 =16. The definition of power can also be extended to zero power and negative power and so on. When inputting mathematical formulas on the computer, because it is inconvenient to input the power, the symbol ""is often used to represent the power. For example, the fifth power of 2 is usually expressed as 2 5.