Σ

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Greek uc sigma.svg
Σ U+03A3, Σ
GREEK CAPITAL LETTER SIGMA
[unassigned: U+03A2]
Ρ
[U+03A1]
Greek and Coptic Τ
[U+03A4]
See also: σ, ς, , , Ʃ, σ., and σ'

Translingual[edit]

Symbol[edit]

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[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]


Greek[edit]

Letter[edit]

Σ ‎(S) ‎(uppercase, lowercase σ)

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

See also[edit]

see: Appendix:Greek alphabet

Numeral[edit]

Σ ‎(S)

  1. The number 200 in Greek numerals.

  1. The number 200,000 in Greek numerals.