XI is the 14th letter of the Greek alphabet (Ξ, ξ), used in mathematics, physics, and various scientific notations. It's a crucial two-letter word for deploying the X tile in Scrabble.
Yes. XI is in the Scrabble-style word list used by our tools and scores 9 points in Scrabble, 9 in Words With Friends and 9 in Wordfeud (base tile values, no board multipliers). Always check the dictionary your game uses (NWL, Collins or the WWF list) before playing.
| Letter | X | I | Total |
|---|---|---|---|
| Scrabble | 8 | 1 | 9 |
| Words With Friends | 8 | 1 | 9 |
| Wordfeud | 8 | 1 | 9 |
XI (uppercase Ξ, lowercase ξ) is the 14th letter of the Greek alphabet, positioned between nu (ν) and omicron (ο). In the Greek numeral system, xi holds a value of 60, making it a significant character in ancient mathematical texts and modern scientific notation.
The letter xi has found extensive use across multiple scientific disciplines. In mathematics, ξ commonly represents random variables, coordinates in transformed systems, and the Riemann xi function—a crucial tool in number theory. Physics employs xi to denote various particles, including the xi baryon family in particle physics, discovered in the 1950s and 1960s.
For word game enthusiasts, XI represents one of the most valuable two-letter plays available. With the X tile worth 8 points in Scrabble, this Greek letter provides an elegant solution for using high-value tiles in constrained board positions. Its validity stems from the acceptance of Greek letters that have entered English usage through scientific and mathematical contexts.
The name "xi" derives from the Phoenician letter samekh, which represented a fish or a prop/support. When the Greeks adopted the Phoenician alphabet around the 8th century BCE, they transformed samekh into xi, altering both its form and phonetic value.
Anagrams: no other word uses exactly the letters of XI.
Hooks: no front hooks; back XIS.
Words inside XI: 0 shorter words can be made from these letters. See all words from XI.