Long ago, Ballantine Beer co-opted the 'okay' sign (index/thumb circle with other three fingers up) into their advertising as a way to order a Ballantine in a bar: the 3-ring sign, because their logo was 3 interlocking rings. I'm looking at one now in my vast bottle collection.

I've seen a book in teh library with pictures and explanantions of gestures from around the world. It was the kind of volume that you look through on the new books shelf but would never borrow or read or remember the author or name of.