Greek Alphabet
Greek letters, LaTeX symbols, and their common uses in math, physics, and statistics.
Angles, alpha particles, significance level
Beta particles, regression coefficients, type II error
Gamma function, Lorentz factor, photons
Change/difference (Δ), small quantities (δ), Dirac delta
Small quantities, permittivity, error
Riemann zeta function, damping ratio
Efficiency, viscosity, learning rate (ML)
Angles, temperature (θ), Big-Theta complexity
Small quantities (rarely used)
Curvature, dielectric constant, condition number
Wavelength, eigenvalues, Poisson rate, Lambda calculus
Mean (μ), micro- prefix (μm), friction coefficient
Frequency (ν), kinematic viscosity
Random variable, Xi baryon
Rarely used (looks like O)
π ≈ 3.14159, product operator (Π)
Density (ρ), resistivity, correlation coefficient
Summation (Σ), standard deviation (σ), Stefan-Boltzmann constant
Time constant (τ), torque, τ = 2π
Rarely used in science
Golden ratio φ, wave function, angle, magnetic flux
Chi-squared test (χ²), chi distribution
Quantum wave function (ψ), polygamma function
Ohms (Ω), angular frequency (ω), Big-Omega complexity