What kind of widget is it?

[aquerci]

Hi guys,

someone can help me to understand what kind of widget has been circled in red in the attached image?

I would very like to replicate it in my GUI but I don't know how. it seems a "LabelFrame" widget (I attached another image), but it's not the same. How can I create the same widget with tkinter?

sorry guys, maybe it's an obvious question, but I don't know tkinter so much, I started studying recently.