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The LaTeX command for ni (∋) is \ni — contains as member.
\niWrite \ni 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.
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Use \ni in math mode — it needs no extra package. For example, $a \ni b$.
None — \ni is built into LaTeX's math mode, so no extra package is required.