German

Noun

Sigma n ‎(genitive Sigma or Sigmas, plural Sigmas)

1. sigma (Greek letter)

Declension

English

Ancient Greek Alphabet

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

Noun

sigma ‎(plural sigmas)

1. The eighteenth letter of the Classical and Modern Greek, the twentieth letter of Old and Ancient.
   • "Herodotus: On The Customs of the Persians", I.139:
     • Their names, which are expressive of some bodily or mental excellence, all end with the same letter---the letter which is called San by the Dorians, and Sigma by the Ionians.
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

1. ↑ Woodard, Roger D. (2006). "Alphabet". In Wilson, Nigel Guy. Encyclopedia of ancient Greece. London: Routldedge. p. 38.

Catalan

Noun

sigma f ‎(plural sigmes)

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

Czech

Noun

sigma n

1. sigma

Finnish

Etymology

< Ancient Greek σίγμα ‎(sígma)

Pronunciation

• IPA^(key): /ˈsiɡmɑ/
• Hyphenation: sig‧ma

Noun

sigma

1. sigma (Greek letter)

Declension

French

Noun

sigma m ‎(plural sigma)

1. sigma (Greek letter)

Italian

Noun

sigma m, f ‎(invariable)

1. sigma (Greek letter)

sigma m ‎(invariable)

1. sigmoid colon

Anagrams

• sgami

Portuguese

Noun

sigma m (plural sigmas)

1. sigma (name of the Greek letter Σ, σ)

Spanish

Noun

sigma f ‎(plural sigmas)

1. sigma; the Greek letter Σ, σ