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The Vulcan salute is based on the ancient Jewish priestly blessing. Leonard Nimoy saw it used at a synagogue in his boyhood, and adapted it for Star Trek.
L'shanah tovah to all our Jewish followers!
(Image: Gage Skidmore.)
@peterdrake It is specifically used on Yom Kippur to entreat god to write people in the 'book of life' for the next year.
It's one of those Trek things that every Jewish person seems to know.