loading tool…
The LaTeX command for Xi (Ξ) is \Xi. The lowercase form ξ is \xi.
\XiWrite \Xi 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.
$\Xi(x) = \Xi_0$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type: no compiler, no signup.
Search all 380+ LaTeX symbols →
Use \Xi in math mode; it needs no extra package. For example, $\Xi(x) = \Xi_0$.
None: \Xi is built into LaTeX, so no extra package is required.