Eta is the seventh letter of the Greek alphabet, representing the close front unrounded vowel,. Originally denoting the voiceless glottal fricative,, in most dialects of Ancient Greek, its sound value
Eta (heta) in the function of /h/ on the ostrakon of Megacles, son of Hippocrates, 487 BC. Inscription: ΜΕΓΑΚLES HIΠΠΟΚRATOS equivalent to the later Μεγακλῆς Ἱπποκράτους. On display in the Ancient Agora Museum in Athens, housed in the Stoa of Attalus.