It seems you have discovered the "Global" NameSpace: I would call it "root," or, "default," but, "unnamed" makes no sense
There are aspects of this NameSpace that you may find unexpected. Few programmers work directly with the Global NameSpace: using it to hold application-wide variables and data is considered poor practice, a violation of SOLID principles.
For sample usages, see: [^
I can't describe the complexity of the Global NameSpace better than this :) c# - What is global::? - Stack Overflow