And even if it still did mean "gigantic screen with impeccable quality controls" like in the days of old, it still wouldn't matter! And that's because a tradem

And even if it still did mean "gigantic screen with impeccable quality controls" like in the days of old, it still wouldn't matter! And that's because a trademark is exclusive rights over using the name for a commercial purpose. So the IMAX folks could make a product called IMAX-VR if they made a VR headset. But the Oculus folks, if they got some 8k phone screen, couldn't call it Oculus-IMAX without a licensing agreement, because IMAX owns the name IMAX with respect to product names. But owning it with respect to product names doesn't mean you can prevent people from using it at all. How else would Coke (tm) be able to tell you in a commercial how much better they are than Pepsi (tm) as a result of some ridiculously staged "public tastings" where regular people prefer Coke (tm) to Pepsi (tm) three to one? Anyone can refer to someone else's trademarked product name full stop. The only thing a trademark does is prevent other people from naming their products the same as, or confusingly similar to, the one which was trademarked first. And if someone thinks their new product name is different enough to be confusing the trademark holder still has to take them to court to prove it.