Originally posted by Orthodox Catholic:
Dear Stuart,
Thanks . . . I . . I think . . .
AlexWell, more seriously, Alex. . .
There was an entire vocabulary of rhetorical gesture in classical antiquity. The way one sat (the classic pose being that of the of the Phidian Zeus, right leg extended, left leg folded back, left arm folded in lap, right arm holding baton or stylus on right knee); the way one moved; the way one combined arm movements with words--it was a fully-formed "art". My guess is that two fingers as a way of getting attention was part of that vocabulary, and that it evolved mainly for aesthetic reasons, long ago forgotten.