The Berbers have been known since ancient times, and their language at one time was probably spoken over most of North Africa. Their languages are quite similar to each other, so much so that some authorities often speak of a single Berber language. No Berber alphabet exists today, though some transcriptions have been made into Arabic. The Tuaregs have a script of their own called Tifinagh, which dates back to ancient times. It is used mainly for inscriptions, however, and no books or periodicals in it as yet exist.