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Del, or nabla, is an operator used in mathematics, in particular, in vector calculus, as a vector differential operator, usually represented by the nabla symbol ?. When applied to a function defined on a one-dimensional domain, it denotes its standard derivative as defined in calculus. When applied to a field , del may denote the gradient of a scalar field , the divergence of a vector field, or the curl of a vector field, depending on the way it is applied.