sigma

Ρρ 18 Ττ

Pronunciation

• IPA ^(key): /ˈsɪɡmə/

• Audio (US)

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Noun

Singular sigma

Plural sigmas

sigma

1. Eighteen letter of Greek.
2. Σσ, and in the word last position, writes as ς.
3. Standard deviation,has formula the average symbol often writes as μ