I didn't know this. I had never seen it. I've used Linux for many years, but not an expert by any means. But it peeked my curiosity, and I found the explanation

I didn't know this. I had never seen it. I've used Linux for many years, but not an expert by any means. But it peeked my curiosity, and I found the explanation in this answer satisfying: https://askubuntu.com/a/135679 https://askubuntu.com/a/135679