σ

σ

1. (mathematics, statistics) Standard deviation.
2. (mathematics) Sum of divisors.
3. (Physics, scattering) Cross_section_(physics).
4. (linguistics, phonology) Syllable.
5. (spatial databases) The select operation.
6. (physics) The Stefan–Boltzmann constant.
7. (chemistry) A shielding constant.

σ, ς (Σ uppercase)

1. The lower case letter sigma (σίγμα), the 18th letter of the modern Greek alphabet. When the final letter in a word of lower case letters is sigma the alternative (ς) form must be used; it may be used only in this final position.

σ'

1. The number 200 in Greek numerals.

,σ

1. The number 200,000 in Greek numerals.

• (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) ᾿ ῾ ´ ` ῀ ¨ ¯ ˘