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The LaTeX command for octonions (π) is \mathbb{O}.
\mathbb{O}Write \mathbb{O} inside math mode β that is, between $β¦$ for inline math or in a \[ β¦ \] / equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
$x \in \mathbb{O}$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type β no compiler, no signup.
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Use \mathbb{O} in math mode after adding \usepackage{amssymb} to your preamble. For example, $x \in \mathbb{O}$.
It comes from the amssymb package β add \usepackage{amssymb} to your preamble.