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Just a simple question.

Let $f(x_1, x_2, \ldots, x_n)$ be a smooth function. Is there a particular name for the function

$\frac{\partial^n f}{\partial x_1 \, \partial x_2 \cdots \partial x_n}$

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    It doesn't usually have a name. Since it's not coordinate-change invariant (see the chain rule), it's not a geometrically-interesting concept.2012-10-28

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This does not have a name. We call it the $n$-th partial difference of $f$ w.r.t. the vector $x$ or variables $x_1$, $x_2$, ..., $x_n$.