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sigma |
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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.
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