It is called the minus sign. - .
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The less than sign I believe that you are talking about is the minus/subtraction sign? The addition sign, +, is the opposite of the subtraction sign :)
i think the difference
The answer to a subtraction problem is called the difference.
Because a negative negative is the same a a positive, and because of the definition of subtraction and addition.
The result of a subtraction problem is called the difference.