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The exponent of a number says how many times to use that number in a multiplication. It is written as a small number to the right and above the base number. 
example: 8^2 = 8 × 8 = 64.

Exponent Operator (^)
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Used to raise a number to the power of an exponent.

The caret (^) is used as the exponentiation operator.

In elementary mathematics, a term is either a single number or variable, or the product of several numbers or variables. Terms are separated by a + or - sign in an overall expression. For example, in

    3 + 4x + 5yzw
    
    3, 4x, and 5yzw are three separate terms. 
    
Arithmetic Mean or Average is a calculated "central" value of a set of numbers.