sigma

English

Ancient Greek Alphabet

← rho		→ tau
Σ σ Ancient Greek: σίγμα
Wikipedia article on sigma

Noun

sigma (plural sigmas)

1. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
2. (mathematics) The symbol Σ, used to indicate summation of a set or series.
3. (statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
   • 2011, Paul Rincon, (bbc.co.uk) LHC: Higgs boson 'may have been glimpsed'

     None of the spikes seen by the experiments is at much more than the "two sigma" level of certainty.
     A level of "five sigma" is required to claim a discovery, meaning there is less than a one in a million chance the data spike is down to a statistical fluke.

Derived terms

• sigmalike
• within one sigma: the range from the mean, plus or minus one standard deviation, usually covering 68% of the data points in a normal distribution

Translations

letter of the Greek alphabet

Arabic: سيغما (ar) (siighmaa) f. Catalan: sigma (ca) f. Chinese: Mandarin: 西格瑪 (zh), 西格马 (zh) (xīgémǎ) Czech: sigma (cs) n. Dutch: sigma (nl) m. French: sigma (fr) m. German: Sigma (de) n.

Greek: σίγμα (el) (sígma) n. Interlingua: sigma (ia) Japanese: シグマ (ja) (shiguma) Korean: 시그마 (ko) (sigeuma) Portuguese: sigma (pt) m. Russian: сигма (ru) (sígma) f. Slovak: sigma (sk) n. Spanish: sigma (es) f.

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Catalan

Noun

sigma f. (plural sigmes)

1. Sigma; the Greek letter Σ (lowercase σ or ς).

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Czech

Noun

sigma n.

1. sigma

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French

Noun

sigma m. inv.

1. sigma (Greek letter)

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Italian

Noun

Wikipedia ^it

sigma m. and f. inv.

1. sigma (Greek letter)

sigma m. inv.

1. sigmoid colon

Anagrams

• sgami

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Spanish

Noun

sigma f. (plural sigmas)

1. sigma; the Greek letter Σ, σ