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Ψ (psi) is the twenty-third letter of the Greek alphabet, used in writing the Greek language. It appears in English primarily through Greek-derived scientific and mathematical terms, making it a symbol readers encounter in academic and technical contexts.
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Article · Polski
Psi (st.gr. ψῖ, nw.gr. ψι, pisana Ψψ) – dwudziesta trzecia litera alfabetu greckiego. W greckim systemie liczbowym oznacza liczbę .
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