Question

why does nodding of the head signify yes and shaking of the head no ? ​

Answer 1

Answer:

One simple theory is that it is a form of bowing, indicating that one is prepared to accept what another person is saying or requesting. It has also been stated that babies, when hungry, search for milk by moving their heads vertically, but decline milk by turning their head from side to side.

Explanation:

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Answer 2

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The Indian head wobble to say 'yes' or 'thank you'

The same head nod is used to show that the person is being attentive to what you're saying. You will observe that the same head shaking gesture is used by someone to show their gratitude. At such times the head nod is accompanied with a smile.