Greek alphabet
In Archaic and early Classical times , the Greek alphabet existed in many local variants , but , by the end of the fourth century BC , the Euclidean alphabet , with twenty-four letters , ordered from alpha to omega , had become standard and it is this version that is still used to write Greek today . 
<triplet> Greek alphabet <subj> alpha <obj> has part <subj> omega <obj> has part <triplet> many local variants <subj> Greek alphabet <obj> subclass of <triplet> Euclidean alphabet <subj> Greek alphabet <obj> facet of <triplet> alpha <subj> Greek alphabet <obj> part of <triplet> omega <subj> Greek alphabet <obj> part of