Here's a handy reference to the greek letters, including variants provided by LaTeX.

TeX versions are \symbol, HTML versions are &symbol;. You can right click and view source on this page to see the HTML versions.

$\alpha \beta \gamma \delta \epsilon \varepsilon \zeta \eta \theta \vartheta \iota \kappa \lambda \mu \nu \xi o\pi \varpi \rho \varrho \sigma \varsigma \tau \upsilon \phi \varphi \chi \psi \omega \Gamma \Delta \Theta \Lambda \Xi \Pi \Sigma \Upsilon \Phi \Psi \Omega$

$\alpha$ $\beta$ $\gamma$ $\delta$ $\epsilon$ $\varepsilon$ $\zeta$ $\eta$ $\theta$ $\vartheta$ $\iota$ $\kappa$ $\lambda$ $\mu$ $\nu$ $\xi$ $o$ $\pi$ $\varpi$ $\rho$ $\varrho$ $\sigma$ $\varsigma$ $\tau$ $\upsilon$ $\phi$ $\varphi$ $\chi$ $\psi$ $\omega$ $\Gamma$ $\Delta$ $\Theta$ $\Lambda$ $\Xi$ $\Pi$ $\Sigma$ $\Upsilon$ $\Phi$ $\Psi$ $\Omega$

${\begin{array}{lcr}{\underline {\mbox{Symbol}}}&{\underline {\mbox{TeX Result}}}\\{\mbox{alpha}}&\alpha \\{\mbox{beta}}&\beta \\{\mbox{gamma}}&\gamma \\{\mbox{delta}}&\delta \\{\mbox{epsilon}}&\epsilon \\{\mbox{varepsilon}}&\varepsilon \\{\mbox{zeta}}&\zeta \\{\mbox{eta}}&\eta \\{\mbox{theta}}&\theta \\{\mbox{vartheta}}&\vartheta \\{\mbox{iota}}&\iota \\{\mbox{kappa}}&\kappa \\{\mbox{lambda}}&\lambda \\{\mbox{mu}}&\mu \\{\mbox{nu}}&\nu \\{\mbox{xi}}&\xi \\{\mbox{o}}&o\\{\mbox{pi}}&\pi \\{\mbox{varpi}}&\varpi \\{\mbox{rho}}&\rho \\{\mbox{varrho}}&\varrho \\{\mbox{sigma}}&\sigma \\{\mbox{varsigma}}&\varsigma \\{\mbox{tau}}&\tau \\{\mbox{upsilon}}&\upsilon \\{\mbox{phi}}&\phi \\{\mbox{varphi}}&\varphi \\{\mbox{chi}}&\chi \\{\mbox{psi}}&\psi \\{\mbox{omega}}&\omega \end{array}}$

${\begin{array}{lcr}{\underline {\mbox{Symbol}}}&{\underline {\mbox{TeX Result}}}\\{\mbox{Gamma}}&\Gamma \\{\mbox{Delta}}&\Delta \\{\mbox{Theta}}&\Theta \\{\mbox{Lambda}}&\Lambda \\{\mbox{Xi}}&\Xi \\{\mbox{Pi}}&\Pi \\{\mbox{Sigma}}&\Sigma \\{\mbox{Upsilon}}&\Upsilon \\{\mbox{Phi}}&\Phi \\{\mbox{Psi}}&\Psi \\{\mbox{Omega}}&\Omega \end{array}}$