ANTALYA, TURKEY—Hürriyet Daily News reports that five additional letters in the Sidetic alphabet have been identified, bringing the total to 31. The letters belong to the lost language once spoken in Side, an ancient port city in Anatolia. Sidetic is related to Anatolia’s Lycian and Carian languages. Feriştah Alanyalı of Anadolu University and her colleagues identified the letters in bilingual inscriptions containing 30 to 40 lines of text that they recently unearthed at the site. “The scarcity of inscriptions and the fact that most consist of only one or two lines make decipherment difficult,” Alanyalı said. Scholars generally agree that the words “Siruawn” and “Siruawan” refer to the city...