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The LaTeX command for twoheadrightarrow (↠) is \twoheadrightarrow — surjection / onto.
\twoheadrightarrowWrite \twoheadrightarrow 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.
$A \twoheadrightarrow B$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\updownarrow\nearrow\searrowSearch all 380+ LaTeX symbols →
Use \twoheadrightarrow in math mode — it needs no extra package. For example, $A \twoheadrightarrow B$.
None — \twoheadrightarrow is built into LaTeX's math mode, so no extra package is required.