A constant!
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It may be called "the constant term".
Let a be any term. Then, the number that is multiplied itself is expressed as: an where a is any real value, and n is any real integer.
When you add a number to itself, you are multiplying it by 2. The usual term for this is you are doubling the number.
square means to multiply the number by itself. so 2 squared is 4 (2x2) etc.
to multiply a number by itself