As for the poll results, I'm sure that owes more to the number of American versus German users.
I'm so happy that no one is accusing me of trying to support an agenda with asking a poll question
I didn't think of the pinky-ring-middle option for "three" when I made the poll. Thinking about it, I have seen that gesture, but it is so rare that it doesn't come to mind until someone else mentions it.
I use the index-middle-ring option for "three." For me, this just seems a logical progression: I show "one" with the index finger, "two" adds the middle finger, "three" adds another finger in that same direction. It seems weird to show one and two with fingers and then flip to the other direction to show three.
I've never seen anyone show one with just the thumb, or two with the thumb and index. The thumb alone means "yes" or "ok" in America. The thumb and index is a gun.
I remember watching an old (70s)
British Irish TV comedian who was missing half his index finger.
Something Dave Allen? He was telling a joke about two men, and he held up his hand to show "two" with his index finger and middle finger. But with his index finger missing above the main joint, it looked like he was giving us all "the finger". It was part of his joke, and the audience laughed hard.
Bullgrit