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  Wikipedia: Sigma

Wikipedia: Sigma
Sigma
From Wikipedia, the free encyclopedia.

Sigma (Σ σ ς) is the 18th letter of the Greek alphabet and has a numeric value of 200. When used at the end of a word, the final form (ς) is used.

The upper-case letter Σ is used as a symbol for:

  • The summation operator forming a series in mathematics.
  • A certain alphabet, of a language, or someother object dependent on an alphabet; expressed in mathematical terms, eg "the language defined by alphabet Σ={a,b,c} and the rules ..."

The lower-case letter σ is used as a symbol for:

  

From Wikipedia, the free encyclopedia. 
Modified by Geona