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The LaTeX command for updownarrow (↕) is \updownarrow.
\updownarrowWrite \updownarrow 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.
$A \updownarrow B$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type — no compiler, no signup.
\to\leftarrow\rightarrow\leftrightarrow\Leftarrow\Rightarrow\Leftrightarrow\iff\implies\uparrow\downarrow\nearrow\searrow\swarrowSearch all 380+ LaTeX symbols →
Use \updownarrow in math mode — it needs no extra package. For example, $A \updownarrow B$.
None — \updownarrow is built into LaTeX's math mode, so no extra package is required.