A quantity which does not equal zero is said to be nonzero. A real nonzero number must be either positive or negative, and a complex nonzero number can have either real or imaginary part nonzero.
See also
Negative, Nonnegative, Nonpositive, Nonvanishing, Positive, Zero
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Cite this as:
Weisstein, Eric W. "Nonzero." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Nonzero.html