IEVref: 102-05-18 ID: Language: en Status: Standard Term: nabla operator Synonym1: nabla Synonym2: Synonym3: Symbol: ∇ Definition: symbolic notation expressed formally as a vector, used to denote scalar or vector differential operators operating at each point of a given space region on scalars or vectors, and which, in orthonormal Cartesian coordinates, is represented by $\mathbf{\nabla }={e}_{x}\frac{\partial }{\partial \text{\hspace{0.17em}}x}+{e}_{y}\frac{\partial }{\partial \text{\hspace{0.17em}}y}+{e}_{z}\frac{\partial }{\partial \text{\hspace{0.17em}}z}$ where ${e}_{x}\text{,}{e}_{y}\text{,}{e}_{z}$ are unit vectors along the x, y, z axesNote 1 to entry: It is recommended to print the symbol ∇ in boldface. Publication date: 2008-08 Source: Replaces: Internal notes: 2017-02-20: Editorial revisions in accordance with the information provided in C00019 (IEV 102) - evaluation. JGO CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: