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I picked only the greek letters that don't resemble latin letters. They are Î“ (Gamma), Î” (Delta), Î˜ (Theta), Î› (Lamba), Îž (Xi), Î (Pi), Î£ (Sigma), Î¦ (Phi), Î¨ (Psi) and Î© (Omega). In my school the classes are divided by greek letters (instead of numbers or latin letters) - I'm in class 3Î©! - and we are studying Ancient Greece, so I guess that's where the inspiration came from.