σ

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See also: ς, Σ, σ., and σ'

σ U+03C3, σ
GREEK SMALL LETTER SIGMA
ς
[U+03C2]
Greek and Coptic τ
[U+03C4]
𝜎 U+1D70E, 𝜎
MATHEMATICAL ITALIC SMALL SIGMA
𝜍
[U+1D70D]
Mathematical Alphanumeric Symbols 𝜏
[U+1D70F]

Translingual[edit]

Symbol[edit]

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. (spatial databases) The select operation.
  7. (physics) The Stefan-Boltzmann constant.
  8. (chemistry) A shielding constant.

Ancient Greek[edit]

Alternative forms[edit]

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

Etymology[edit]

Derived from its majuscule counterpart Σ.

Letter[edit]

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[edit]

See also sigma

See also[edit]

Greek[edit]

Alternative forms[edit]

  • ς (s) (only at the end of a word)

Letter[edit]

σ (s) (lowercase, uppercase Σ)

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

See also[edit]