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The LaTeX command for OR (∨) is \lor — bitwise/logical OR.
\lorWrite \lor 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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\mathcal{O}\Omega\Thetao\oplus\land\neg\mid\lfloor x \rfloor\lceil x \rceil\top\bot\models\mathcal{NP}Search all 380+ LaTeX symbols →
Use \lor in math mode — it needs no extra package. For example, $\lor$.
None — \lor is built into LaTeX's math mode, so no extra package is required.