Greek letters must be written using the following three letter abbreviations:
α | alf | ι | iot | ρ | rho | ||
β | bet | κ | kap | σ | sig | ||
γ | gam | λ | lam | τ | tau | ||
δ | del | µ | mu. | υ | ups | ||
ε | eps | ν | nu. | φ | phi | ||
ζ | zet | ξ | ksi | χ | khi | ||
η | eta | o | omi | ψ | psi | ||
θ | tet | π | pi. | ω | ome |