Gibson’s explanation of the password

“As to what the word is, well, I never considered it to be a word, really, though 3Jane, teasingly, calls it one. It is in fact three “notes”, something akin to birdcall. The key to the cipher, that is, is revealed as being purely tonal, musical, rather than linguistic. Case’s “cry”, a species of primal scream, the voicing of the emotionality he’s been walled off from throughout the narrative (and his life), torn finally from the core of his being, is what actually forces 3Jane to give up the key. Call and response, of some kind. Hearing him, she can’t help herself. When she taunts him (“Take your word, thief.”) she’s in fact daring him, and assuming he can’t — just as she was, a moment before, daring Molly to kill her. ”

(via his blog post)