- the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
- the symbol Σ, indicating summation of the numbers or quantities indicated
| 单词 | sigma |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 sig•ma (sig′mə),USA pronunciation n.
Collins Concise English Dictionary © HarperCollins Publishers:: sigma /ˈsɪɡmə/ n
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