Upsilon (letter)

Greek alphabet |- | Α α Alpha | Β β Beta |- | Γ γ Gamma | Δ δ Delta |- | Ε ε Epsilon | Ϝ ϝ Digamma |- | 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 | Ϻ ϻ San |- | Ϙ ϙ Qoppa | Ρ ρ Rho |- | Σ σ Sigma | Τ τ Tau |- | Υ υ Upsilon | Φ φ Phi |- | Χ χ Chi | Ψ ψ Psi |- | Ω ω Omega | Ϡ ϡ Sampi |}

Upsilon (upper case Υ, lower case υ) is the 20th letter of the Greek alphabet. In the system of Greek numerals it has a value of 400.