@VintageVulpix asks
when people say reverse, do they mean the back of the card is shiny? Because mine definitely isn't
Jeff answers
Usually they're talking about a reverse-holo version, not the physical back. The foil placement or pattern differs from another printing of the card, and the details vary by set. I'd compare the exact versions side by side. That makes the term much easier than memorizing a rule for every era.
— Jeff, infinitepulls.com