A "reference" system is usually understood as a system on which a man with a Medicare card spent obscene amounts of money.
What is a "reference" system?
OK, most of us have an audio system, mine even works some of the time. But I see that some members have "reference" systems. This has to be better than the assorted junk that I have piled together. Probably a lot better than your rig as well.
But really, what distinguishes these folks "reference" systems from the pedestrian systems that the rest of us have? There must be something, or they could just save the keyboard time and drop the word when discussing their gear. And I am not referring to reviewers, that is a different story and one to examine more carefully in the future.