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The LaTeX command for Theta (Θ) is \Theta. The lowercase form θ is \theta.
\ThetaWrite \Theta 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.
$\Theta(x) = \Theta_0$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 \Theta in math mode; it needs no extra package. For example, $\Theta(x) = \Theta_0$.
None: \Theta is built into LaTeX, so no extra package is required.