Chi Symbol
Χ χ
The chi symbol (Χ / χ) is a letter of the Greek alphabet. This page covers its meaning across mathematics, science, and engineering, its Unicode code point, TeX command, and Windows Alt codes — and you can copy and paste the chi symbol with one click.
Uppercase Chi Symbol (Χ)
| Symbol | Format | Data |
|---|---|---|
| Χ | Unicode | U+03A7 |
| Χ | HTML | Χ |
| Χ | CSS | \03a7 |
| Χ | JavaScript | \u03A7 |
| TeX | \Chi | |
| SVG | Download ↓ | |
 | Image | Download ↓ |
Also known as: uppercase chi, big chi, chi capital, capital chi, greek capital x.
The capital Greek letter Chi (Χ) is visually identical to the Latin capital X and therefore sees little independent use as a mathematical symbol. The lowercase χ, by contrast, is standard in statistics for the chi-squared distribution. Where Χ appears, it serves as a label or variable in contexts enumerating Greek capitals.
Lowercase Chi Symbol (χ)
| Symbol | Format | Data |
|---|---|---|
| χ | Unicode | U+03C7 |
| χ | HTML | χ |
| χ | CSS | \03c7 |
| χ | JavaScript | \u03C7 |
| TeX | \chi | |
| SVG | Download ↓ | |
 | Image | Download ↓ |
Also known as: chi, lowercase chi, small chi, greek chi, chi squared, chi square symbol, greek x.
χ is the twenty-second letter of the Greek alphabet. In statistics it appears in the chi-squared test and distribution, written χ²; in physics it denotes quantities such as electric and magnetic susceptibility; and in topology it denotes the Euler characteristic. It is used as a standalone variable or with superscripts and subscripts.
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