SIGMA
sigma
(noun) the 18th letter of the Greek alphabet
Source: WordNet® 3.1
Etymology
Noun
sigma (plural sigmas or sigmata)
The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient.
• "Herodotus: On The Customs of the Persians", I.139
Their names, which are expressive of some bodily or mental excellence, all end with the same letter---the letter which is called San by the Dorians, and Sigma by the Ionians.
(mathematics) The symbol Σ, used to indicate summation of a set or series.
(statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
Anagrams
• Magis., agism, migas
Source: Wiktionary
Sig"ma, n.; pl. Sigmas. Etym: [L., from Gr.
Definition: The Greek letter S, or s). It originally had the form of the
English C.
Source: Webster’s Unabridged Dictionary 1913 Edition