today I come with a silly doubt but it has me restless. I have always used workbench for my database management but now it turns out that I need phpmyadmin to make a clone of my database.

The problem is that when I opened it I found that two of my databases were inside a strange icon like books in a box.

And that icon is named BD, I want to relax and think that it is just grouping all the tables called bd_**** but I don't know and it has me worried.

What does that symbol mean?

Thank you very much