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the 18th letter of the Greek alphabet: Σ, σ, ς.
the consonant sound represented by this letter.
the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
(maths) the symbol Σ, indicating summation of the numbers or quantities indicated

sigma sig·ma (sĭg’mə)

Symbol ς The 18th letter of the Greek alphabet.
A sigma baryon.

A scientific visual programming environment from NASA.


Read Also:

  • Sigma factor

    sigma factor n. A protein component of RNA polymerase that determines the specific site on DNA where transcription begins.

  • Sigma-particle

    noun, Physics. 1. an unstable hyperon having positive, negative, or zero electric charge and strangeness −1. Symbol: Σ.

  • Sigmate

    adjective 1. having the form of the Greek sigma or the letter S. adjective 1. shaped like the Greek letter sigma or the Roman S

  • Sigmatism

    noun 1. defective pronunciation of sibilant sounds.

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