Acquiescence can also be used as a form of non-verbal welcome or recognition of the presence of another; In this context, it is essentially a particularly gentle form of flexion, with just enough movement to show a certain degree of respect without additional formality. This includes the traditional headbly down or the headbly up (which is more informal and is usually used among friends or subordinates). To increase the formality, the nodding down can also be accompanied by an appropriate oral welcome. The emphasis on raised eyebrows and eye rolling is so large that the actual head strand upwards has become secondary.. . .