All words are made up terms. And some are just shorthand so that people know what we’re talking about when we discuss a subject.
Sometimes people can discuss a subject without having full knowledge of the details. I can discuss my HVAC system with my plumber by using semi generic terms that allows us to complete successful communication without me becoming an expert HVAC system installer.
Yes, but your HVAC system is physical, while the mind is intangible to the author.