 Coptic provides the clearest indication of Later Egyptian phonology from its writing system, which fully indicates vowel sounds and occasionally stress pattern.The phonological system of Later Egyptian is also better known than that of the Classical phase of the language because of a greater number of sources indicating Egyptian sounds, including cuneiform letters containing transcriptions of Egyptian words and phrases, and Egyptian renderings of Northwest Semitic names.Coptic sounds, in addition, are known from a variety of Coptic-Arabic papyri in which Arabic letters were used to transcribe Coptic and vice versa.