She definitely knows more about it than he does - he was more or less going off the fact that they are tall cards that ostensibly represent something. It makes sense, of course, that they might be unique in a different culture.

"This world's equivalent, I would wager," he says, nodding his head. "These symbols mean something to the people here... though I have not attempted to glean what."

Out of the principle of the thing, really. He doesn't see why he should have to care what he is by their labeling system.