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Chi

From Teflpedia

Chi /ˈkaɪ/ (uppercase Χ, lowercase χ) is the 22nd letter of the Greek alphabet.

Χ χ

It’s usually transliterated into English as ⟨ch⟩ within Greek loanwords. It is a homoglyph with the letter X though.

It’s also in the name of the chi squared distribution and chi squared test.