Sayhadic had its own writing system, the Ancient South Arabian Monumental Script, or Ms3nd,[REF] consisting of 29 graphemes concurrently used for proto-Ge'ez in the Kingdom of D`mt, ultimately sharing a common origin with the other Semitic abjads, the Proto-Sinaitic alphabet.
The last inscription of these languages dates back to 554 CE, 60 years before the appearance of Islam [REF].