You’re looking at some decompiled code – specifically, something that was generated by the compiler.
The compiler uses <> (this is an implementation detail) because, whilst it’s valid for a CLR identifier to start with such characters, it’s not valid in C# – so it’s guaranteed that the name will not conflict with any names in the C# code.
why the compiler has generated this code varies – it can be the implementation of a lambda, or an iterator or async block, and possibly some other reasons also.
And, hopefully the other part of your question is also answered – there’s a . in front of it for the usual reasons – to separate namespace portions, or more likely in this case, to separate the name of a nested class from the name of the enclosing class.