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The LaTeX command for Omega (Ω) is \Omega. The lowercase form ω is \omega.
\OmegaWrite \Omega inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
$\Omega(x) = \Omega_0$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type: no compiler, no signup.
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Use \Omega in math mode; it needs no extra package. For example, $\Omega(x) = \Omega_0$.
None: \Omega is built into LaTeX, so no extra package is required.