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The LaTeX command for mathcal S (๐ฎ) is \mathcal{S}.
\mathcal{S}Write \mathcal{S} inside math mode โ that is, between $โฆ$ for inline math or in a \[ โฆ \] / equation block for display math. It is part of core LaTeX math, so no extra package is required.
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Use \mathcal{S} in math mode โ it needs no extra package. For example, $\mathcal{S}$.
None โ \mathcal{S} is built into LaTeX's math mode, so no extra package is required.