THE HEAD WOBBLE…WHAT IS THAT ABOUT!?

It’s intrinsically part of Indian communication and fascinating to observe. But I am no closer to defining its meaning. I’ve even attempted to replicate it myself. I just look silly. So here’s a brief summary of the possibilities.
“Yes.” “No”. “Perhaps.” “I’m not sure.” "How are you?" “I’ve no idea what you’re saying but I may just get away with a smile and a head wobble.”
If I find out more, I´ll update this information!