Sigma
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 235. 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 | Σσς | 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 | Ⱶⱶ | Heta |
| Ϻϻ | San | Ϙϙ | Koppa |
| Ϡϡ | Sampi | Ϛϛ | Stigma |
| Ϸϸ | Sho | ||
|
| |||
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 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]
Sigma Media
The Madaba Map, a sixth-century mosaic of Jerusalem (Η ΑΓΙΑ ΠΟΛΙϹ) uses the lunate sigma
A plaque reading "Metochion of Gethsemane" (Μετόχιον Γεθσημανῆς) in Jerusalem, with a lunate sigma both at the end and in the middle of the word
Related page
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.
