The expression \( 7 \div 0 \) represents division by zero, which is mathematically undefined. In mathematics, division by zero does not yield a valid result, and thus we cannot assign a numerical value to this operation.
Step 2: Conclusion on the Result
Since division by zero is undefined, we conclude that the result of the expression \( 7 \div 0 \) is not a number. Therefore, we denote this result as "undefined."