What do you call a trilogy of 7?

I'm curious, could you please clarify what you mean by "a trilogy of 7"? Typically, a trilogy refers to a set of three related works, such as books, films, or even video games. So, when you say "a trilogy of 7," it seems to be a bit of a contradiction, as "trilogy" inherently implies a set of three. Could you possibly be referring to a series or collection of seven items that are somehow interconnected or related? Or is there a specific context or cultural reference that I'm missing? I'd appreciate it if you could elaborate on your question so I can provide a more accurate answer.