In Robert Chambers’ 1906 novel The Tracer of Lost Persons, Mr. Keen copies the figure above from a mysterious photograph. He is trying to help Captain Harren find a young woman with whom he has become obsessed.

“It’s the strangest cipher I ever encountered,” he says at length. “The strangest I ever heard of. I have seen hundreds of ciphers — hundreds — secret codes of the State Department, secret military codes, elaborate Oriental ciphers, symbols used in commercial transactions, symbols used by criminals and every species of malefactor. And every one of them can be solved with time and patience and a little knowledge of the subject. But this … this is too simple.”

The message reveals the name of the young woman whom Captain Harren has been seeking. What is it?