Greek alphabet cheat sheet

All 24 letters on one A4 page. Use the print button (or Ctrl+P) and choose “Save as PDF” to keep a copy.

Letter	Name	LaTeX	Sound (ancient · modern)	Usual meaning
Αα	Alpha	\alpha	[a] · [a]	Significance level (α) and Type I error.
Ββ	Beta	\beta	[b] · [v]	Regression coefficients (β).
Γγ	Gamma	\gamma \Gamma	[g] · [ɣ]	Used in models/estimation with Gamma/Exponential families.
Δδ	Delta	\delta \Delta	[d] · [ð]	Difference of means/effects: Δ.
Εε	Epsilon	\varepsilon	[e] · [e]	Error/residual (ε) in regression.
Ζζ	Zeta	\zeta	[dz] · [z]	Riemann zeta function ζ(s).
Ηη	Eta	\eta	[ɛː] · [i]	Effect size: η² (ANOVA).
Θθ	Theta	\theta \Theta	[tʰ] · [θ]	Model parameter to be estimated (θ).
Ιι	Iota	\iota	[i] · [i]	Rare notation today; may indicate inclusion/index.
Κκ	Kappa	\kappa	[k] · [k]	Cohen's Kappa (agreement measure).
Λλ	Lambda	\lambda \Lambda	[l] · [l]	Rate/regularization parameter (λ).
Μμ	Mu	\mu	[m] · [m]	Population mean (μ).
Νν	Nu	\nu	[n] · [n]	Degrees of freedom (ν).
Ξξ	Xi	\xi \Xi	[ks] · [ks]	Sometimes used for latent observations/noise.
Οο	Omicron	o	[o] · [o]	Notation: o_p(1), O_p(·) in asymptotic theory.
Ππ	Pi	\pi \Pi	[p] · [p]	May denote proportion/probability (π).
Ρρ	Rho	\rho	[r] · [r]	Population correlation (ρ).
Σσς	Sigma	\sigma \Sigma	[s] · [s]	Population standard deviation (σ).
Ττ	Tau	\tau	[t] · [t]	Kendall's τ (rank correlation).
Υυ	Upsilon	\upsilon \Upsilon	[u] · [i]	Seldom used; sometimes in special functions.
Φφ	Phi	\varphi \Phi	[pʰ] · [f]	Φ(z): CDF of N(0,1) in tests and CIs.
Χχ	Chi	\chi	[kʰ] · [x]	χ² tests (goodness-of-fit/independence).
Ψψ	Psi	\psi \Psi	[ps] · [ps]	Digamma ψ in MLE of Gamma/Dirichlet.
Ωω	Omega	\omega \Omega	[ɔː] · [o]	Formal basis: (Ω, F, P).

greekalpha.bet · Note: notations vary between books/fields; these are the most common usages.