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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.