Sigma

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

Sigma ( SIG-mə; uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. When it is used at the end of a letter-case word (one that does not use all caps), the final form (ς) is used.

Excerpt from the Wikipedia article “Sigma”, 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.