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The LaTeX command for equilibrium (⇌) is \rightleftharpoons — chemical equilibrium.
\rightleftharpoonsWrite \rightleftharpoons 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.
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\hbar\nabla\nabla^2\nabla \cdot\nabla \times\partial\dot{x}\ddot{x}\langle \psi || \psi \rangle\langle \phi | \psi \rangle\text{\AA}^\circ\text{C}\inftySearch all 380+ LaTeX symbols →
Use \rightleftharpoons in math mode — it needs no extra package. For example, $\rightleftharpoons$.
None — \rightleftharpoons is built into LaTeX's math mode, so no extra package is required.