The term 'SOME GREEK VOWELS' refers to two of the seven vowels used in the Greek alphabet. The first vowel is 'Eta' (η), which is pronounced as a long 'e' sound and is represented by the letter 'Ε'. The second vowel is 'IOTA' (ι), which is pronounced as a short 'i' sound and is represented by the letter 'Ι'. Both of these vowels are used in the modern Greek language, as well as in Ancient Greek.