Let me provide some cartesian coordinates first: X, Y, Z axes.
Imagine your spine is Z, across the shoulders is X and chest to back is Y. So nodding your head up and down would be in the Z-Y plane (what we Americans do for "yes"), and shaking your head side to side would be moving along the X-Y plane (what we American do for "no").
Now imagine moving your head in the Z-X plane, kind of like a bobble head. Well, I'm familiar with this sort of head nod, but it usually means "yes" or "OK, sure" or other ways of conveying affirmation. But here, I think it means NO!? still trying to figure that out, must do some more research.
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