sigma

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English[edit]

Ancient Greek Alphabet

rho
Greek uc sigma.svgGreek lc sigma1.pngGreek lc sigma2.png
tau
Σ σ
Ancient Greek: σίγμα
Wikipedia article on sigma


Noun[edit]

sigma (plural sigmas)

  1. The name for the eighteenth letter of the Classical and Modern Greek, the twentieth 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[edit]

  • 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[edit]


Catalan[edit]

Noun[edit]

sigma f (plural sigmes)

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

Czech[edit]

Noun[edit]

sigma n

  1. sigma

Finnish[edit]

Etymology[edit]

< Ancient Greek σίγμα (sígma)

Greek letter
Σσ
Previous: rhoo
Next: tau
Finnish Wikipedia has an article on:

Wikipedia fi

Pronunciation[edit]

  • IPA(key): /ˈsigmɑ/
  • Hyphenation: sig‧ma

Noun[edit]

sigma

  1. sigma (Greek letter)

Declension[edit]


French[edit]

Noun[edit]

sigma m (plural sigma)

  1. sigma (Greek letter)

External links[edit]


Italian[edit]

Noun[edit]

Italian Wikipedia has an article on:

Wikipedia it

sigma m, f (invariable)

  1. sigma (Greek letter)

sigma m (invariable)

  1. sigmoid colon

Anagrams[edit]


Spanish[edit]

Noun[edit]

sigma f (plural sigmas)

  1. sigma; the Greek letter Σ, σ