σ

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See also: ς, Σ, σ., and σ'

σ U+03C3, σ
GREEK SMALL LETTER SIGMA
ς
Greek and Coptic τ
𝜎 U+1D70E, 𝜎
MATHEMATICAL ITALIC SMALL SIGMA
𝜍
Mathematical Alphanumeric Symbols 𝜏

Translingual

Symbol

σ

  1. (mathematics, statistics) Standard deviation.
  2. (mathematics) Sum of divisors.
  3. (mathematics) Braid group algebra.
  4. (physics, scattering) Cross section.
  5. (linguistics, phonology) Syllable.
  6. (phonology, obsolete) a labialized alveolar fricative (value uncertain, possibly IPA ).
  7. (spatial databases) The select operation.
  8. (physics) The Stefan-Boltzmann constant.
  9. (chemistry) A shielding constant.

Ancient Greek

Alternative forms

  • ϲ (s)lunate sigma
  • ς (s)word-final position

Etymology

Derived from its majuscule counterpart Σ.

Letter

σ (s) (lowercase, uppercase Σ)

  1. Lower-case sigma (σίγμα), the 18th letter of the ancient Greek alphabet. It represented the voiceless alveolar fricative /s/. It is preceded by ρ and followed by τ.

Derived terms

See also sigma

See also

Greek

Alternative forms

  • ς (s) (only at the end of a word)

Letter

σ (s) (lowercase, uppercase Σ)

  1. The lower case letter sigma (σίγμα), the 18th letter of the modern Greek alphabet.

See also