Turkey's is a T and Vietnam's is a R. I know ASL because my nephew is deaf and my son cannot speak. T is thumb between middle and pointer. R is middle and pointer crossed. Pillydear must be looking at Vietnam because they described it correctly and the link showed it correctly.
I'm from the Philippines and the people who use the index finger sign are really those who are hesitant to use the middle finger (maybe it's to obscene for them idk). I used to do that as a kid.
This image states otherwise.
Yeah, like she said (she dibs).
Well... Kinda. And Irish is ununderstandable, so, hang on it, boy, you can do it ;)