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The LaTeX command for otimes (⊗) is \otimes — tensor product.
\otimesWrite \otimes 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.
$a \otimes b$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 \otimes in math mode — it needs no extra package. For example, $a \otimes b$.
None — \otimes is built into LaTeX's math mode, so no extra package is required.