What is the only letter in alphabet that has three syllables?

This is a bit of a trick question! There isn't a letter in the alphabet that has three syllables.

Let's break down why:

* Syllables are units of pronunciation in a word. They usually contain one vowel sound.

* Letters are individual symbols in a writing system. They don't have syllables themselves.

So, while we might say the *name* of a letter (like "A" or "Bee"), that's a word, not the letter itself.