IEVref: 103-03-04 ID: Language: en Status: Standard Term: signum Synonym1: Synonym2: Synonym3: Symbol: sgn Definition: function of a real variable equal to –1 for all negative values of the variable, +1 for all positive values and 0 for the zero valueNote 1 to entry: The signum can be generalized to complex variables as $\text{sgn}\text{\hspace{0.17em}}\underset{_}{z}=\frac{\underset{_}{z}}{|\underset{_}{z}|}$ for $z\ne 0$ and $\text{sgn}\text{\hspace{0.17em}}0=0$. Publication date: 2009-12 Source: Replaces: Internal notes: 2017-02-20: Editorial revisions in accordance with the information provided in C00020 (IEV 103) - evaluation. JGO CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: