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sigma
(redirected from Lunate sigma)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
sigma
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 [′sigĀ·mə]
(invertebrate zoology)
A C-shaped spicule.

portico
1. A covered entrance whose roof is supported by a series of columns or piers, commonly placed at the front entrance to a building.
2. A stoa.

SIGMA - A scientific visual programming environment from NASA.

http://fi-www.arc.nasa.gov/fia/projects/sigma/.


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