SIGMA

Sigma

Sigma is the eighteenth letter of the Greek alphabet, and carries the 's' sound. In the system of Greek numerals, it has a value of 200. When used at the end of a word, and the word is not all upper-case, the final form is used, e.g. . Note the two sigmas in the center of the name, and the word-final sigma at the end.

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sigma

Noun

  1. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
  2. The symbol Σ, used to indicate summation of a set or series.
  3. The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.


The above text is a snippet from Wiktionary: sigma
and as such is available under the Creative Commons Attribution/Share-Alike License.

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