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The LaTeX command for sup is \sup — supremum.
\supWrite \sup inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. It is part of core LaTeX math, so no extra package is required.
$\sup f(x)$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type — no compiler, no signup.
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Use \sup in math mode — it needs no extra package. For example, $\sup f(x)$.
None — \sup is built into LaTeX's math mode, so no extra package is required.