Psi

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

Psi (P)SY, (P)SEE (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi [ˈpsi]) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word "lapse").

Excerpt from the Wikipedia article “Psi (Greek)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dcoetzee, F l a n k e r, Public domain, via Wikimedia Commons.