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The LaTeX command for infty (∞) is \infty — infinity.
\inftyWrite \infty 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.
$\infty f(x)$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 \infty in math mode — it needs no extra package. For example, $\infty f(x)$.
None — \infty is built into LaTeX's math mode, so no extra package is required.