Greek letters (LaTeX2e unofficial reference manual (November 2018))

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#### 16.2.7 Greek letters

The upper case versions of these Greek letters are only shown when they differ from Roman upper case letters.

Symbol | Command | Name |
--- | --- | --- | ---
α | `\alpha` | Alpha
β | `\beta` | Beta
γ, Γ | `\gamma`, `\Gamma` | Gamma
δ, Δ | `\delta`, `\Delta` | Delta
ε, ϵ | `\varepsilon`, `\epsilon` | Epsilon
ζ | `\zeta` | Zeta
η | `\eta` | Eta
θ, ϑ | `\theta`, `\vartheta` | Theta
ι | `\iota` | Iota
κ | `\kappa` | Kappa
λ, Λ | `\lambda`, `\Lambda` | Lambda
μ | `\mu` | Mu
ν | `\nu` | Nu
ξ, Ξ | `\xi`, `\Xi` | Xi
π, Π | `\pi`, `\Pi` | Pi
ρ, ϱ | `\rho`, `\varrho` | Rho
σ, Σ | `\sigma`, `\Sigma` | Sigma
τ | `\tau` | Tau
ϕ, φ, Φ | `\phi`, `\varphi`, `\Phi` | Phi
χ | `\chi` | chi
ψ, Ψ | `\psi`, `\Psi` | Psi
ω, Ω | `\omega`, `\Omega` | Omega

For omicron, if you are using LaTeX’s default Computer Modern font then enter omicron just as ‘`o`’ or ‘`O`’. If you like having the name or if your font shows a difference then you can use something like `\newcommand\omicron{o}`. The package `unicode-math` has `\upomicron` for upright omicron and `\mitomicron` for math italic.

While the set membership relation symbol ∈ generated by `\in` is related to epsilon, it is never used for a variable.

Unofficial LaTeX2e reference manual