Nod of Acknoweldgement
The act of acknowledging someones existence by nodding, most often used between males of lower generations however has become a practice which people of all ages perform. The act of nodding ones head is usually a sign of friendship between two people. A common phrase used during the nod of acknowledgement "y'alright" is used to show an appreciation for the other person. The phrase 'nod of acknowledgement' was coined in the year 1823, however use of the phrase has only recently peaked over the past decade.
Dan used the Nod of Acknoweldgement as he approached Jim in the alleyway.
Steve nodded in acknowledgement when he saw his work colleague in the store.