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It certainly has some cultural significance to Vulcans; it seems meaningless to Humans. It is implied to be some type of 'Vulcan foreplay', because this is the context in which it is seen between Saavik and the young, rejuvenated Spock on the Genesis Planet in Star Trek III: The Search for Spock, The bit seen in ST:TOS "Journey to Babel" probably has some significance as to announcing the relationship between Sarek and Amanda ProfessorTrek 05:53, August 8, 2011 (UTC)

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