>What are these?

DANIEL: “Anyway, where did you see these symbols?”

CLARA: “I think… Bonnie, remember when we were in that spooky place with the pillars and… Architect, that was his name. One of the creepy tall people.”

BONNIE: “Right.”

CLARA: “I was floating somewhere for a bit - and it was like I was nowhere, I think, but then… I was talking to something and it asked me to pick a number? Wait, maybe these are numbers!”