See also: σ, ς, , , Ʃ, σ., and σ'

Σ U+03A3, Σ
[unassigned: U+03A2]
Greek and Coptic Τ

Translingual edit

Symbol edit


  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 edit

(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 edit

  • (classification of formulae): Π, Δ

See also edit

Ancient Greek edit

Alternative forms edit

Etymology edit

From Phoenician𐤔(š, šīn).

Letter edit

Σ (S) (uppercase, nonfinal lowercase σ, final lowercase ς)

  1. The letter sigma (σίγμα), the 18th letter of the ancient Greek alphabet.

Derived terms edit

See also edit

Greek edit

Letter edit

Σ (S) (uppercase, lowercase σ)

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

Numeral edit

Σ (S)

  1. The number 200 in Greek numerals.

  1. The number 200,000 in Greek numerals.

See also edit

see: Appendix:Greek alphabet