What is "safaitic"

Safaitic is a variety of the South Semitic script used by the nomads of the basalt desert of southern Syria and northern Jordan, the so-called Ḥarrah, to carve rock inscriptions in various dialects of Old Arabic. The Safaitic script is a member of the Ancient North Arabian (ANA) sub-grouping of the South Semitic script family, the genetic unity of which has yet to be demonstrated.