Sigma-ring

Okay, imagine you have a special playground with lots of different toys, like swings, slides, and toys to play with in the sandbox. But, you don't want to let anyone just run around the playground and play with all the toys, you want to have some rules.

So, you decide that only the kids who are wearing a special bracelet can come in and play with the toys. But, you also want to make sure that the kids don't break any of the toys or hurt themselves while playing.

To do this, you create a set of rules that the kids must follow when playing with the toys in the playground. You call this set of rules a "sigma-ring".

Now, whenever a kid comes to play in the playground, they have to put on the special bracelet and follow the sigma-ring rules. This makes sure that everyone has fun and stays safe while playing.