The only thing I can think of that you might mean is an imaginary or complex number. Since there is no solution to √(-1) mathematicians labeled it as i which is the imaginary number, and any number that includes purely i is also imaginary. Complex numbers are a mix of both real and imaginary numbers. for example 3 is real, 5i is imaginary and 3+5i is complex. Hopefully this answers what you meant.
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Unreal
Yes, they are.
Yes.For example, any number divided by 0 is unreal. There is no defined representation of (i.e.) 12/0.
Math
math 7