Ecstasy is usually shortened as "XTC", "E" or "X"

not new at all

Maybe not new, but not very common in the US. And further confusing given that MDMA & XTC are synonyms then.

The term "XTC" was a lot more common in the 90s rave scene.

As far as being synonyms, people generally differentiate between "ecstasy"/"E" as MDMA in pill form and "molly" as MDMA in powder form.

I've always heard that MDMA refers to pure MDMA, while E refers to MDMA that has been cut with something. Must be a colloquial thing.

Fascinating, I just call it all molly.

But maybe that's because I grew up in a time where you can send stuff to a lab to confirm what it is.

molly is pure MDMA

XTC aka ecstacy is MDMA + additives like speed or caffeine/whatever.