Two of the scientists use the word “exotic” in the new possibilities:

At the same time, this type of old environment is making us rethink our standard FRB progenitor models and turning to more exotic formation channels

If yes, it would make this FRB only the second FRB known to reside in a globular cluster. If not, we would have to consider alternative exotic scenarios for the FRB’s origin.”

I’m curious what constitutes exotic in this context.