What is the LaTeX mathematical symbol for the greek uppercase letter chi (Χ)?

The LaTeX code for the Greek uppercase letter Chi (Χ) is \Chi. However, Greek uppercase Chi looks identical to the Latin letter X, which is why there's rarely a specific command for the uppercase, and you can use the regular Latin X in most cases. For the lowercase chi (χ), use \chi.

  • $ \Chi $ displays X\Chi
  • $ \chi $ displays χ\chi

Here’s how to use them in a LaTeX document:


The uppercase Greek letter Chi: X or \Chi

The lowercase Greek letter chi: $\chi$


Make sure you are in math mode (using $...$ or $$ ... $$) when writing Greek letters other than the uppercase Chi that looks like the Latin X.