The head bobble, head wobble, or Indian head shake refers to a common gesture found in South Asian cultures, most notably in India. The motion usually consists of a side-to-side tilting of the head in arcs along the coronal plane.[1] A form of nonverbal communication, it may mean yes, good, maybe, okay, or I understand, depending on the context.[2][3]
tripsavvy
was invoked but never defined (see the help page).