Copy and paste the capital xi Ξ with one click
Last reviewed on October 31, 2026
Capital Ξ is the uppercase xi, a stack of three bars. Particle physics names the Xi baryons with it. It also appears in statistical mechanics for a grand partition function and in some papers for a generic parameter.
Its official Unicode name is Greek Capital Letter Xi. Browse the Greek Letters page for related characters.
Type 039E then press Alt+X in Word; in other apps, copy Ξ from this page and paste it. It has no classic Alt code. You can also copy Ξ straight from this page.
Press Ctrl+Cmd+Space to open the Character Viewer, then search for the symbol by name.
It is Unicode code point U+039E, named Greek Capital Letter Xi. In HTML, use Ξ or the numeric reference Ξ.