Xi Symbol
About Xi Symbol
Ξ is the Xi Symbol, the fourteenth letter of the Greek alphabet in its uppercase form. Ξ denotes the xi baryon in particle physics and the Riemann Xi function in mathematics.
【Pronunciation】 In English, Ξ is most often pronounced ZYE (IPA: /zaɪ/). This is simply the anglicized name of the Greek letter.
The uppercase Xi Symbol Ξ is written as a distinct capital Greek glyph and is assigned codepoint U+039E in the Greek and Coptic Unicode block. Its uppercase form is unmistakably Greek and clearly distinct from any Latin letter.
【Historical Origin】 Like every Greek letter, Ξ was adapted from a Phoenician consonant and entered mathematical and scientific notation through the work of ancient Greek scholars, remaining in continuous use to the present day.
【Common Uses】 Ξ is highly active across disciplines and frequently appears alongside other Greek capitals such as Δ (Δ), Σ (Σ), Π (Π) and Ω (Ω) in formulas, papers, and engineering drawings. Its clear shape and long tradition make it a standard symbol in many fields.
How to Type Xi Symbol
Windows Input
Method 1: Hold Alt and type 926 on the numeric keypad, then release Alt to get Ξ.
Mac Input
Method 2: Press Control + Command + Space to open the Character Viewer, search for "greek" or "Xi Symbol", then select Ξ.
HTML/CSS Input
HTML: Ξ or Ξ; CSS: content: "\039E";
LaTeX Input
Use the \Xi command in LaTeX math mode to produce Ξ.
Xi Symbol FAQ
How is Ξ pronounced?
The English pronunciation of Ξ is ZYE (IPA: /zaɪ/). It is the anglicized name of the Greek letter, used directly rather than described as "uppercase Ξ".
What is the difference between Ξ and the Latin letter X?
Ξ (U+039E) is a distinct Greek capital with its own codepoint and shape, unrelated to any Latin letter; it is never confused with a Roman character.
How do I type Ξ in Word, web pages, and LaTeX?
On Windows use Alt+926 on the numeric keypad; on Mac open the Character Viewer and search "greek" or "Xi Symbol"; on the web use the HTML entity Ξ; in LaTeX use \Xi.