sigma
/ˈsɪɡmə/
词源链
- 英语English
sigma
词源说明
From Ancient Greek σῖγμα (sîgma), probably from the root σῑγ- (sīg-) as seen in σίζω (sízō, “to hiss”) + -μα (-ma, nominal suffix).
释义
名词noun
- 1The eighteenth letter of the Classical and Modern Greek alphabets (Σ, σ), the twentieth letter of Old and Ancient.
- 2(mathematics) The symbol Σ, used to indicate summation of a set or series.
- 3(statistics