χ (EN)

letter, symbol

letter “χ”

1. the 22nd letter of the Greek alphabet
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   In the Greek word "χαρά," the letter "χ" is the first letter and is pronounced like the "ch" in "Bach."

symbol “χ”

1. (in statistics) a symbol used to represent the chi-squared distribution
   The scientist used the χ² test to analyze the experimental results.
2. (in mathematics) a symbol used to represent a characteristic function or polynomial
   In the equation, χ represents the unknown characteristic of the system.
3. (in phonetics) a symbol used to represent a consonant sound made at the back of the throat
   Linguists use χ to denote a sound similar to the "ch" in the Scottish word "loch".