Sigma
noun
1.
the 18th letter of the Greek alphabet: Σ, σ, ς.
2.
the consonant sound represented by this letter.
noun
1.
the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
2.
(maths) the symbol Σ, indicating summation of the numbers or quantities indicated
sigma sig·ma (sĭg’mə)
n.
Symbol ς The 18th letter of the Greek alphabet.
sigma
(sĭg’mə)
A sigma baryon.
A scientific visual programming environment from NASA.
(http://fi-www.arc.nasa.gov/fia/projects/sigma/).
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