Jazm is the earliest style of 'modern' Arabic script, it was the first script to start using the Arabic alphabet used today. It was a product of its surrounding environment. Old Arabic scripts, that don't have the current alphabet, didn't just vanish but adapted to the newer scripts. Muramir bin Murrah at-Taa’iee is credited to be one of the first people to write with the script.

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The top example was inscribed in Jabal al-Usays found south of Damascus, Syria. It dates back to 528 C.E. which is highlighted green. The one below shows a Greek-Arabic inscription that was found in Harran, south Damascus, dated to 568 C. E. 

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This script is more angular and stiff compared to the Arabic script we use today. I would assume the main reason it was like that was because of the tools they had to work with. The way the letters flow if unique. It lays the shapes of the letters horizontally employing smoother curves.​

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