Sigma
eighteenth letter of the Greek alphabet
(Redirected from Sigma (letter))
Sigma (uppercase/lowercase Σ σ ς) is the 18th letter of the Greek alphabet. It is used to represent the "s" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 200. Letters that came from it include the Roman S and Cyrillic С.
![]() | |||
Greek alphabet | |||
---|---|---|---|
Αα | Alpha | Νν | Nu |
Ββ | Beta | Ξξ | Xi |
Γγ | Gamma | Οο | Omicron |
Δδ | Delta | Ππ | Pi |
Εε | Epsilon | Ρρ | Rho |
Ζζ | Zeta | Σσ | Sigma |
Ηη | Eta | Ττ | Tau |
Θθ | Theta | Υυ | Upsilon |
Ιι | Iota | Φφ | Phi |
Κκ | Kappa | Χχ | Chi |
Λλ | Lambda | Ψψ | Psi |
Μμ | Mu | Ωω | Omega |
Other letters | |||
Ϝϝ | Digamma | Ϟϟ | Koppa |
Ϛϛ | Stigma | Ϡϡ | Sampi |
Ͱͱ | Heta | Ϸϸ | Sho |
Ϻϻ | San | ||
Category•Commons |
Mathematics
The uppercase Σ is the shorthand symbol for summation (the symbol is also known as the summation operator).[1] It is often used to condense Taylor series and to write out trigonometric functions such as sine, cosine, and tangent as series.
The lowercase σ is used to represent population standard deviation in statistics, and permutation function in abstract algebra.[1][2]
Related pages
References
- ↑ 1.0 1.1 "Greek/Hebrew/Latin-based Symbols in Mathematics". Math Vault. 2020-03-20. Retrieved 2020-10-07.
- ↑ "Sigma Symbol in Greek Alphabet". www.greeksymbols.net. Retrieved 2020-10-07.