Writing script
Paleo-Arabic (or Palaeo-Arabic, previously called pre-Islamic Arabic or Old Arabic) is a pre-Islamic Arabian script used to write Arabic. It began to be used in the fifth century, when it succeeded the earlier Nabataeo-Arabic script, and it was used until the early seventh century, when the Arabic script was standardized in the Islamic era.
Evidence for the use of Paleo-Arabic was once confined to Syria and Jordan. In more recent years, Paleo-Arabic inscriptions have been discovered across the Arabian Peninsula including: South Arabia (the Christian Hima texts), near Taif in the Hejaz and in the Tabuk region of northwestern Saudi Arabia. 
Most Paleo-Arabic inscriptions were written by Christians, as indicated by their vocabulary, the name of the signing author, or by the inscription/drawing of a cross associated with the writing.
The term "Paleo-Arabic" was first used by in the form of the French expression "paléo-arabe".
Classification.
Paleo-Arabic refers to the Arabic script in the centuries prior to the standardization Arabic underwent in the Islamic era. According to Ahmad Al-Jallad and Hythem Sidky, Paleo-Arabic can be distinguished from the script that occurs in later periods by a number of orthographic features, including:
Genres.
Known Paleo-Arabic inscriptions fall into one of three categories:
As such, they reflect the dominance attained by the spread of monotheism in pre-Islamic Arabia from the fourth to sixth centuries in the pre-Islamic period.
Terminology.
God.
Paleo-Arabic inscriptions most commonly refer to "God" as "al-ʾilāh" or by its orthographic variant "illāh", though the term "Rabb" for "Lord" also appears as is seen in the Abd Shams inscription, Jabal Dabub inscription, and the Ri al-Zallalah inscription.
Introductory formulae.
The present corpus of Paleo-Arabic inscriptions attests the following introductory formulae:
Calendar.
Several Paleo-Arabic inscriptions, including the Jebel Usays inscription and the Hima Paleo-Arabic inscriptions typically date events according to the Bostran era, whose beginning is the equivalent of the year 106 in the Gregorian calendar. However, at least one, the Zabad inscription (known from Syria) uses the Seleucid era. 
List of Paleo-Arabic inscriptions.
The current list of known Paleo-Arabic texts and inscriptions is given in a table and appendix of a paper jointly written by Ahmad Al-Jallad and Hythem Sidky.
References.
Citations.
 ;templatestyles src="Reflist/styles.css" / ;