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What does this mathematical symbol mean?
ξ Xi (capital ξ, lowercase ξ) is the 14 Greek letter.

Pronunciation of Chinese characters: gratifying

Chinese Pinyin: ksai

Capital ξ is used for ξ baryons in particle physics.

Lowercase ξ is used for: random variables in mathematics.

Cyrillic? (Ksi) evolved from Xi.

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