Nandinagari is a special way of writing that people used a very long time ago in a place called South Asia. It's like a secret code that makes shapes and lines to show different sounds and words. Instead of using letters like we do now, they used pictures of what looked like little houses, or sticks with little hats on them. These shapes were all squished together in lines to make sentences and stories. Nowadays, people don't really use Nandinagari anymore, but some people still like to learn about it because it's really interesting to see how people used to write a long time ago.