File:Chi_uc_lc.svg · Wikimedia Commons · See Wikimedia Commons
Also known as Χ, χ, chi (Greek), khi (Greek)
Greek letter “chi” or “khi”
Chi (Χ/χ) is a letter from the ancient Greek alphabet that represents a hard "kh" sound, similar to the "ch" in the German word "Bach." It appears in English primarily through Greek-derived words and scientific terminology, and is also used as a symbol in mathematics and other fields.
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History
Archaic local variants
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).