Σ U+03A3,Σ GREEK CAPITAL LETTER SIGMA [unassigned: U+03A2] ←Ρ [U+03A1] Greek and Coptic Τ → [U+03A4]

Σ

1. (mathematics)Σ.Sum over aset of liketerms:

   ${\displaystyle \sum _{n=1}^3{n}^2=1^2+2^2+3^2=14}$

2. (topology)suspension orreduced suspension
3. (mathematics) A class (in thearithmetical hierarchy) offormulae whose outermost unboundedquantifiers areexistential quantifiers

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

• (classification of formulae):Π,Δ

• Σ on Wikipedia.Wikipedia

• Ϲ(S)

FromPhoenician𐤔(š,“šīn”).

Σ• (S) (uppercase,nonfinal lowercaseσ,final lowercaseς)

1. The lettersigma (σίγμα), the 18th letter of the ancientGreek alphabet.

• (Cyrillic)С
• (Coptic)Ⲥ

• (Greek-script letters)Α α,Β β,Γ γ,Δ δ,Ε ε,Ζ ζ,Η η,Θ θ,Ι ι,Κ κ,Λ λ,Μ μ,Ν ν,Ξ ξ,Ο ο,Π π,Ρ ρ,Σ σ ς,Τ τ,Υ υ,Φ φ,Χ χ,Ψ ψ,Ω ω
• (non-Classical letters)Ϝ(W)ϝ(w),Ͷͷ,Ͱ(H)ͱ(h),Ϻ(S)ϻ(s),Ϟϟ,Ϙ(Q)ϙ(q),Ͳ(S)ͳ(s)
• (punctuation)·;
• (diacritics)᾿῾◌́◌̀῀¨

Σ• (S)

1. A counter forstaters. An abbreviation ofστατήρ(statḗr). Used as a tally mark, as in ΣΣΣΣ (4 staters) and Τ𐅐𐅏ΣΣΣ (1 talent 18 staters).

• 𐅏 (5 staters)
• 𐅐 (10 staters)
• 𐅑 (50 staters)
• 𐅒 (100 staters)
• 𐅓 (500 staters)
• 𐅔 (1,000 staters)
• 𐅕 (10,000 staters)
• 𐅖 (50,000 staters)

Σ• (S) (uppercase,lowercaseσ)

1. Theupper case lettersigma (σίγμα), the 18th letter of the modernGreek alphabet.

Σ• (S)

1. The number 200 inGreek numerals.

,Σ

1. The number 200,000 in Greek numerals.

see:Appendix:Greek alphabet

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