What does the index finger salute mean?
Well, judging by the length of that digit, the old "It's a myth" thang is ringing true.
http://www.freerepublic.com/focus/news/3260535/posts
usbu al-shahada — the finger of shahada, shahada being the fundamental declaration of faith of Muslims: There is but one God and Muhammad is his messenger.
I think that is supposed to mean that Allah is the one God. Not sure, though.