'Universes'. Another unfamiliar word, but the rest of her explanation overlaps enough with what Mira had told him that he can make sense of it. He might not be thinking in the correct scale - he imagines worlds among the stars instead of multiversal reality - but the principle of 'somewhere else' is clear enough.

However, that doesn't answer the question he'd been trying to ask, so he shakes his head.

"No, what's it called"