Calls didn't make sense to them in this context. Neither did signal. But at least the last part was straightforward enough. They were becoming fairly competent at picking up on context clues since arriving here, especially given how dumb they've always been.

"Like the mirrors?" they asked, thoughtful. Helpfully, they paused for a moment to fish something out of the shabby bag slung over one shoulder, and held it up in demonstration -- a hand mirror, the same kind everyone woke up with here.