Quotes from The Diamond Age:

"Their hard shoes were treacherous on the cobblestones, their chins were in the air so that their high white collars would not saw their heads off. They had arisen many hours ago in their tiny high-rise warrens, their human coin lockers on the island south of New Chusan, which was Hindustani."

"What are letters?"
"Kinda like mediaglyphics except they're all black, and they're tiny, they don't move, they're old and boring and really hard to read. But you can use 'em to make short words for long words."