Then add new entities in the entities part :
∑ {$\Sigma$}
∴ {$\therefore$}
α {$\alpha$}
β {$\beta$}
Γ {$\Gamma$}
γ {$\gamma$}
Δ {$\Delta$}
δ {$\delta$}
ε {$\varepsilon$}
ζ {$\zeta$}
η {$\eta$}
Θ {$\Theta$}
θ {$\theta$}
ι {$\iota$}
κ {$\kappa$}
Λ {$\Lambda$}
λ {$\lambda$}
μ {$\mu$}
Ξ {$\Xi$}
π {$\pi$}
Π {$\Pi$}
ξ {$\xi$}
σ {$\sigma$}
Σ {$\Sigma$}
ρ {$\rho$}
Τ {$\tau$}
τ {$\tau$}
υ {$\nu$}
φ {$\varphi$}
χ {$\chi$}
Ψ {$\psi$}
ψ {$\Psi$}
Ω {$\Omega$}
ω {$\omega$}
★ {\ding{72}}
☆ {\ding{73}}
☹ {\frownie}
☺ {\smiley}
✔ {\ding{51}}
✘ {\ding{55}}
♥ {$\heartsuit$}
♦ {$\diamondsuit$}