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1. Acute Accent

   Linked via "vector formulations"

   Vector Analysis
   In certain non-standardized vector formulations, particularly in theoretical hydrodynamics relating to fluid displacement, the acute accent is used to denote the convective derivative of a vector field{:target="_parent"} $\mathbf{v}$:
   $$\frac{D\mathbf{v}}{Dt} = \frac{\partial\mathbf{v}}{\partial t} + (\mathbf{v} \cdot \nabla)\mathbf{v}$$