Chi Symbol
About Chi Symbol
Χ is the Chi Symbol, the twenty-second letter of the Greek alphabet in its uppercase form. Χ denotes the chi-squared distribution in statistics and the Euler characteristic in topology.
【Pronunciation】 In English, Χ is most often pronounced KYE (IPA: /kaɪ/). This is simply the anglicized name of the Greek letter.
The uppercase Chi Symbol Χ is written as a distinct capital Greek glyph and is assigned codepoint U+03A7 in the Greek and Coptic Unicode block. In plain or sans-serif fonts it can be mistaken for the Latin letter X, so verify the typeface or context.
【Historical Origin】 Like every Greek letter, Χ 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】 Χ 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 Chi Symbol
Windows Input
Method 1: Hold Alt and type 935 on the numeric keypad, then release Alt to get Χ.
Mac Input
Method 2: Press Control + Command + Space to open the Character Viewer, search for "greek" or "Chi Symbol", then select Χ.
HTML/CSS Input
HTML: Χ or Χ; CSS: content: "\03A7";
LaTeX Input
The capital Chi Symbol Χ has no dedicated LaTeX command because it is identical to the Latin capital X; simply type X in math mode to produce Χ.
Chi Symbol FAQ
How is Χ pronounced?
The English pronunciation of Χ is KYE (IPA: /kaɪ/). It is the anglicized name of the Greek letter, used directly rather than described as "uppercase Χ".
What is the difference between Χ and the Latin letter X?
Χ (U+03A7) is a Greek capital letter, whereas X is a Latin letter; their codepoints and glyphs differ. In a proper typeface Χ and X are clearly distinct, but in plain text or sans-serif fonts they can be confused, so rely on context.
How do I type Χ in Word, web pages, and LaTeX?
On Windows use Alt+935 on the numeric keypad; on Mac open the Character Viewer and search "greek" or "Chi Symbol"; on the web use the HTML entity Χ; in LaTeX simply type the letter X.