[nayuki]

While bored in high school math class around the year 2005, I forced myself to learn the Greek alphabet. That very much came in handy in university, as Greek letters are frequently used for variables in computer science, mathematics, and physics.

[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