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This tag is for questions on the meaning, history, and usage of various symbols and notation that are used to denote different quantities in physics. Don't forget to mention the reference, where you encountered those notations.

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Directional derivative $(\mathbf{A}\cdot\nabla)\mathbf{B}$ of the vector field $\mathbf{B}$

Griffiths, I have encountered some issue with the notation of the directional derivative of the vector field and I was wondering if there are any simple terms to put it. … The vector identity and the notation in question appear also in this article on Wikipedia without further treatment. …