Najran Abar Hima site, Saudi Arabia. © Eric Lafforgue www.ericlafforgue.com. All rights reserved. Original file hosted on flickr and displayed under the terms of their API.
The pre-Islamic rock art of Arabia at Bir Hima, carved into the eastern foothills of the Asir Mountains, is one of the most important rock art sites in Saudi Arabia. Most of what you’ll see dates from around 5500 BC, although there are more recent examples scattered around.
Here’s more:
See this article: Notes on the Origin and Development of Writing in Arabia

Comparative chart of Arabian scripts. From the Saudi Arabian Ministry of Education / Smithsonian National Museum of Natural History.
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