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The $14$th letter of the Greek alphabet.

Minuscule: $\xi$
Majuscule: $\Xi$

The $\LaTeX$ code for \(\xi\) is \xi .

The $\LaTeX$ code for \(\Xi\) is \Xi .

Linguistic Note

The Greek letter $\Xi$, $\xi$ (xi) is properly pronounced ksi (to rhyme with high), not the frequently-heard zi or si, which is probably a hypercorrection.

It represents the sound whose task is fulfilled by the letter X in the English alphabet.