σ

See also: ς, Σ, σ., and σ'

σ U+03C3, σ GREEK SMALL LETTER SIGMA ← ς [U+03C2] Greek and Coptic τ → [U+03C4]

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

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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

• (Greek-script letters) Α α (A a), Β β (B b), Γ γ (G g), Δ δ (D d), Ε ε (E e), Ζ ζ (Z z), Η η (Ē ē), Θ θ (Th th), Ι ι (I i), Κ κ (K k), Λ λ (L l), Μ μ (M m), Ν ν (N n), Ξ ξ (X x), Ο ο (O o), Π π (P p), Ρ ρ (R r), Σ σ ς (S s s), Τ τ (T t), Υ υ (U u), Φ φ (Ph ph), Χ χ (Kh kh), Ψ ψ (Ps ps), Ω ω (Ō ō)
• (punctuation) · ;
• (diacritics) ᾿ ῾ ´ ` ῀ ¨ ¯ ˘
• σ΄ (s΄)
• ͵σ (͵s)