(supplementary) The *upward* nod of acknowledgement has quite different connotations to the *downward* nod of acknowledgement.
The user of the *upward* nod of acknowledgement displays the nostrils and their contents to the subject, whilst symultaneously looking down on them. It therefore signals disrespect.
The *downward* nodder looks up to the subject, displaying submission to them. It therefore signals respect.
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