The LaTeX command for dfrac (⁄) is \dfrac{a}{b} (display-style fraction).
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Write \dfrac{a}{b} inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. This symbol needs the amsmath package, so add \usepackage{amsmath} to your preamble.
In display math \dfrac{a}{b} takes its full size; inline it shrinks to fit the line, and \displaystyle forces the large form. With unicode-math under XeLaTeX or LuaLaTeX, typing ⁄ in a formula gives the same symbol.
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Use \dfrac{a}{b} in math mode after adding \usepackage{amsmath} to your preamble. For example, $\dfrac{a}{b} f(x)$.
It comes from the amsmath package: add \usepackage{amsmath} to your preamble.