[jimkleiber]

Also plastered on frat and sorority houses all over town :-) (at least at many universities in the US)

[nayuki]

The full alphabet?

[moi2388]

You aren’t familiar with the α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ ς τ υ φ χ ψ ω sorority?

[radiator]

First time I see ς as part of the alphabet. Looks as if there were 25 letters.

[moi2388]

It’s also a variant of sigma