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The LaTeX command for Leftarrow (⇐) is \Leftarrow.
\LeftarrowWrite \Leftarrow 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.
$A \Leftarrow B$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\Rightarrow\Leftrightarrow\iff\implies\uparrow\downarrow\updownarrow\nearrow\searrow\swarrowSearch all 380+ LaTeX symbols →
Use \Leftarrow in math mode — it needs no extra package. For example, $A \Leftarrow B$.
None — \Leftarrow is built into LaTeX's math mode, so no extra package is required.