Theta
Theta (uppercase Θ / lowercase θ), is a letter in the Greek alphabet. It represents the "th" sound (as in "think") in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 9. The Cyrillic letter Ѳ came from theta.
| 160px | |||
| 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 | ||
|
| |||
In mathematics, the lowercase θ is used as a variable to represent an angle, and the uppercase Θ is used in big-theta notation (a variant of big-O notation).[1] The lowercase θ is also used to represent the potential temperature in meteorology.[2]
Theta Media
- Theta uc lc with variant.svg
Modern print theta, in a typical uppercase and two different lowercase glyph forms.
- Earth symbol.svg
A symbol of a cross within a circle
- Cross within circle 2.svg
Another symbol of a cross within a circle
- Circled dash.svg
The symbol of a line within a circle
- Sun symbol.svg
The symbol of a point within a circle
- Tau gallic CourDOr Metz 3147.jpg
The name ARAÐÐOVNA on a Gaulish tombstone
