Nod for yes is not universal, in parts of Asia you’d wiggle your head side to side (not turn like shaking your head as a no, but actually sway your head side to side). You’d nod your head up to indicate No in Greece and Turkey among others. Bulgaria and Albania even completely swapped the yes-nod and no-shake.

But all of those places also consume North American/Western European media, so the concepts are mostly understood and even homogenising.