Translingual

Symbol

Σ

1. (mathematics) Σ. Sum over a set of like terms:

   

2. (topology) suspension or reduced suspension
3. (mathematics) A class (in the arithmetical hierarchy) of formulae whose outermost unbounded quantifiers are existential quantifiers

Usage notes

(mathematics): Though there exists a distinct symbol (∑) for the purpose of the mathematical summation, the upper case sigma here is often used for convenience.

Coordinate terms

• (classification of formulae): Π, Δ

See also

• Σ on Wikipedia.Wikipedia

Greek

Letter

Σ • ‎(S) ‎(uppercase, lowercase σ)

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

See also

see: Appendix:Greek alphabet

Numeral

Σ • ‎(S)

1. The number 200 in Greek numerals.

,Σ

1. The number 200,000 in Greek numerals.

Translingual

Symbol

σ

1. (mathematics, statistics) Standard deviation.
2. (mathematics) Sum of divisors.
3. (linguistics, phonology) Syllable.
4. (spatial databases) The select operation.

Greek

Letter

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.

Numeral

σ'

1. The number 200 in Greek numerals.

,σ

1. The number 200,000 in Greek numerals.

See also

• Greek alphabet: Αα Ββ Γγ Δδ Εε Ζζ Ηη Θθ Ιι℩ Κκ Λλ Μμ Νν Ξξ Οο Ππ Ρρ Σσς Ττ Υυ Φφ Χχ Ψψ Ωω