Theta (priflythyren Θ; llythyren fach θ) yw'r wythfed lythyren yn yr wyddor Roeg.
Yn y system rhifolion Groegaidd, mae ganddi werth o 9.
Yr wyddor Roeg | |
---|---|
Α α Alffa | Ν ν Nu |
Β β Beta | Ξ ξ Xi |
Γ γ Gamma | Ο ο Omicron |
Δ δ Delta | Π π Pi |
Ε ε Epsilon | Ρ ρ Rho |
Ζ ζ Zeta | Σ σ ς Sigma |
Η η Eta | Τ τ Tau |
Θ θ Theta | Υ υ Upsilon |
Ι ι Iota | Φ φ Ffi |
Κ κ Kappa | Χ χ Chi |
Λ λ Lambda | Ψ ψ Psi |
Μ μ Mu | Ω ω Omega |
Llythrennau Hynafol | |
Ϝ ϝ Fau | Ϻ ϻ San |
Ϛ ϛ Stigma | Ϟ ϟ Qoppa |
Ͱ ͱ Heta | Ϡ ϡ Sampi |
Ϸ ϸ Sho |
Defnyddir fel symbol mathemategol am ongl.
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