Even just a simple head movement depends on the culture, as nodding for "yes" and shaking the head for "no" is not universal [0][1]. And this doesn't even account for something like the "indian head bobble". [2]

Another example is the use of index finger and thumb to create an O. [3]

So if these very simple examples depend on the culture, I expect signing to be much more localized.

[0]: https://en.wikipedia.org/wiki/Nod_(gesture)

[1]: https://en.wikipedia.org/wiki/Head_shake

[2]: https://en.wikipedia.org/wiki/Head_bobble

[3]: https://en.wikipedia.org/wiki/OK_gesture#Negative_connotatio...