There is a more subtle version of it, which is quite common in the film, where character A is asked a question and character B essentially blinks in agreement or nods with the eyes or eyelids. They don`t move their heads, and they can say something, but usually when they haven`t used it to deliberately not clarify 100% of what character B intentions are. I can`t imagine a concrete example, but I`ve mostly seen it in high-voltage situations, when a group of characters is trying to determine which side of the fence each person is, or during interrogation scenes. Different cultures attribute different meanings to the gesture. Acquiescence to display the “yes” vote is widespread and appears in many different cultural and linguistic groups. Areas where the acquiescence head is generally of this importance are the Indian subcontinent (note that the head bubble is also consistent), the Middle East, Southeast Asia, most of Europe (see below), South America and North America. The nod can also be used as a sign of recognition in some areas, or to show respect. An insult can be inferred if it is not returned in kind. A nod is a gesture by which the head is tilted in arcs of high and alternating descent along the sagittal plane. In many cultures, it is used most often, but not in general, to indicate conformity, acceptance or recognition. However, their description of “Nodding with his eyes and eyelids” sounds like a wink. A wink can certainly be used to indicate “You are in my secret,” and would often be accompanied by the most subtle head heads as a reference to tacit concordance. I think you will notice that, in most cases, a person “blinking in agreement or acquiescing with his eyes or eyelids” is quite difficult to interpret as a “yes or a clear no.” So it`s no surprise that we don`t have a single word for that.
As can be seen in some of the examples above, a wink is ambiguous in the absence of a small nod or other signal to confirm intent. Rather, it could mean (or be interpreted as) “Don`t believe me, I`m duplicated,” or even “be careful, it`s dangerous.” In other words, a wink might not indicate an agreement, or conversely, it might actually indicate an agreement, but it might not be interpreted in this way. Context, knowledge of the other person and body language are all here! If you say that someone has acquiesced, it means that they bow their heads and lift them up to signify their approval without having to say anything. She nodded to the waiter so he could bring the cake. The acquiescence head is also a symptom of nick disease, a disease still inexplicable. It mainly concerns children under the age of 15 and was first documented in Tanzania in 1962.  Paul nods again with his eyes and responds to John, but does not record his answer. In Greece, the only head sign down that indicates the “yes” is often combined with simultaneous eye closure. This nod often involves a very light, almost unnoticed, rotation from the head to the left (or to the right).
There are different theories as to why the head head is so often used to indicate acceptance. A simple theory is that it is a form of reverence, suggesting that you are willing to accept what another person says or asks for. [Citation required] It has also been said that babies, when they are hungry, look for milk by moving their heads vertically, but refuse milk by turning their heads side by side. “Paul, were you or weren`t you in the suspects` house two nights ago?” asks Officer John. “Was it a yes? Please confirm the audio recording orally. There are several exceptions: in Greece, Cyprus, Iran, Turkey, Bulgaria, Albania and Sicily, a single nod upwards (not down) indicates a “no.” Some cultures also exchange meanings between head heads and heads. English Learning Definition of the Head Head (entry 2