I always find it funny, no matter what the product or industry.... the people who invent, produce, improve, re-engineer said product define the product and the parts... and yet the gov't comes in with their own vague definitions and bastardizations of the same parts... all to confuse in order to exert control.
I work in a gov't regulated industry, and for the most part, they don't (sometimes can't) change and redefine things, but in instances where they can, they will.
I've had to talk to a gov't regulator during an audit before, and after they asked me some questions, I had to tell them I needed to go look for the documents... what I did first was ask my boss wtf they were looking for because I had no idea what they were talking about. Once he clarified it, I didn't even need documents, I went back and answered them.
Ridiculous. Also, they are always suspicious that, what is in reality a mistake, they believe there is some underlying malicious intent.