Theta
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| Greek alphabet | |
|---|---|
| Α α Alpha | Β β Beta |
| Γ γ Gamma | Δ δ Delta |
| Ε ε Epsilon | Ζ ζ Zeta |
| Η η Eta | Θ θ Theta |
| Ι ι Iota | Κ κ Kappa |
| Λ λ Lambda | Μ μ Mu |
| Ν ν Nu | Ξ ξ Xi |
| Ο ο Omicron | Π π Pi |
| Ρ ρ Rho | Σ σ Sigma |
| Τ τ Tau | Υ υ Upsilon |
| Φ φ Phi | Χ χ Chi |
| Ψ ψ Psi | Ω ω Omega |
| obsolete letters | |
| [[Digamma|Template:Polytonic Digamma]] | [[San (letter)|Template:Polytonic San]] |
| [[Qoppa|Template:Polytonic Qoppa]] | [[Sampi|Template:Polytonic Sampi]] |
- Note: A theta probe is a device for measuring soil moisture
Theta (upper case Θ, lower case θ) is the eighth letter of the Greek alphabet. In the system of Greek numerals it has a value of 9.
The lower-case letter θ is used as a symbol for:
- A plane angle in geometry.
- θ is the voiceless (inter)dental fricative in the International Phonetic Alphabet.
The upper-case letter Θ is used as a symbol for:
The letter Θ is an abbreviation for the Greek word thanatos (θάνατος: "death"; see Thanatos and Thanatology) and as it vaguely resembles a human skull, was occasionally used by Greeks as a warning symbol for death, in much the same way that skull and crossbones are used today.
The Cyrillic letter Fita arose from Theta.
Θ is used in Analysis of algorithms to denote an asymptotically tight bound.
ca:Theta de:Theta el:θήτα es:Theta fr:Θ ja:Θ nl:Thèta pl:Theta fi:Theeta ru:фита sv:Theta zh:Θ