<P> A hat tip is an act of tipping or (especially in British English) doffing one's hat as a cultural expression of recognition, respect, gratitude, or simple salutation and acknowledgement between two persons . </P> <P> In Western societies of the 19th and early 20th centuries, a hat tip was a common non-verbal greeting between friends or acquaintances while walking or meeting at a social gathering . Typically, two men (female hat tipping was rare) would lift or tip their hats to each other, rather than exchange words of greeting . Where the ritual was used to emphasize social distance, the subordinate was obliged to make the more elaborate gesture, for example fully removing his hat while the superior merely touched his . The military hand salute is thought to have originated as a stylized hat tip; while the civilian may return a salute via a hat tip . In its modern use, the hat tip has been replaced by the nod as a manner of respect . If one man gives another the nod, he should return in kind with either the casual nod up or the formal nod down . </P> <P> Erving Goffman emphasized the role of hat - tipping as a means of closing encounters between male and female, and restoring both parties thereby to a state of civil inattention . He also suggested that the hat tip was used for greeting a stranger, whereas the equivalent greeting for an acquaintance was the bow . </P>

Where did the custom of tipping your hat come from
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