An Athenian vessel fragment incised with part of the Greek alphabet, as it appeared in the sixth century B.C. Athenian Agora Excavations. For more information, click the image. Key Terms and Concepts SPELL IT LIKE IT SOUNDS SHORT AND LONG VOWELS DIPHTHONG IOTA SUBSCRIPT VOWEL CONTRACTION Chapter Navigation Key Terms and Concepts Vowels Diphthongs and Vowel Contraction Exercises Book Nav Vowels