Here are the characters from the standard Greek encoding ISO-8859-7, together with their positions in the encoding.
‘ ’ £ ¦ § ¨ © « ¬ ― ° ± ² ³ ΄ ΅ Ά · Έ Ή Ί » Ό ½ Ύ Ώ ΐ
Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω
Ϊ Ϋ ά έ ή ί ΰ
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
ϊ ϋ ό ύ ώ
Hey: the ‘psilo’ in ‘epsilon’ and ‘upsilon’ is ψιλο, which means unaspirated. Of course, the ‘micro’ and ‘mega’ in ‘omicron’ and ‘omega’ are μικρο and ομεγα, which mean little and big, respectively.