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\begin{tabular}{ll}
\hline
$\alpha$ & fine-structure (dimensionless) constant, approximately $1 / 137$ \\
$\alpha$ & radiation of doubly-ionized helium ions, He++ \\
$\beta$ & radiation of electrons \\
$\gamma$ & radiation of very high frequency, beyond that of X rays \\
$\gamma$ & Euler's constant, approximately $0.577\,215\,\ldots{}$ \\
$\delta$ & stepsize in numerical integration \\
$\delta(x)$ & Dirac's famous function \\
$\epsilon$ & a tiny number, usually in the context of a limit to zero \\
$\zeta(x)$ & the famous Riemann zeta function \\
\ldots{} & \ldots{} \\
$\psi(x)$ & logarithmic derivative of the gamma function \\
$\omega$ & frequency \\
\hline
\end{tabular}