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.

Greek

Letter

ς, σ (Σ uppercase)

1. The lower case letter sigma (σίγμα τελικό) of the Greek alphabet when used as the final letter in a word. In all other positions in a word the normal sigma (σ) must be used.