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The sign of a number, also called Sgn, is $-1$ for a Negative number (i.e., one with a Minus Sign ``$-$''), 0 for the number Zero, or $+1$ for a Positive number (i.e., one with a Plus Sign ``$+$'').

See also Absolute Value, Minus Sign, Negative, Plus Sign, Positive, Sgn, Zero

© 1996-9 Eric W. Weisstein