Old North Arabian script is a ancient way that people used to write their language a long, long time ago, before we had computers or even books. The way they wrote looked different than the way we write now, and some of the letters maybe even looked like pictures of things.
The script was used in a place called Arabia, which is a big area in the Middle East. This script was used to write different languages that people spoke in Arabia, like Dadanitic and Nabataean.
But why did they need to write in this way? Well, they needed a way to keep track of important information and important stories, like how we use books and the internet now. They also used it to write things down on rocks and stones, because there weren't any papers or calendars like we have today.
Even though we don't use Old North Arabian script anymore, it's still important to study it because it tells us a lot about how people lived and communicated a long time ago.