Vulcan finger-touching

Vulcan-Romulan relations — Vulcan finger-touching between Spock and a Romulan Commander

Vulcan marriage ceremony — Finger-touching at a Vulcan marriage ceremoney

Vulcan finger-touching was a ritualistic form of affection among Vulcans. The behavior was also occassionally used between a Vulcan and a member of another species, such as between Sarek of Vulcan and Amanda Grayson of Earth. (TOS: "Journey to Babel") Another example of this was between Spock and a Romulan female commander. (TOS: "The Enterprise Incident") Finger-touching was also sometimes involved in sex between Vulcans. (Star Trek III: The Search for Spock) Some Vulcan marriages also incorporated finger-touching. (ENT: "Home")

In a Q&A, Roberto Orci said they considered having Spock and Uhura finger-touching in Star Trek, "but JJ [Abrams] correctly pointed out that a new audience would have no idea what was going on." [1]

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It can also be noted that in the later star trek movie, Star Trek: Into Darkness that Kirk and Spock touch fingers while Kirk is dying. Finger touching may also be seen in relationships such as this one, with friendship or endearment.