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Leonard Nimoy: Biography and Much More From:
"Nimoy,(Dr. Spock), also devised the Vulcan Salute consisting of a raised hand, palm forward with the fingers parted
between the middle and ring finger. It is said to be based on the traditional kohanic blessing, which is performed with both
hands, thumb to thumb in this position; a position thought to represent the Hebrew letter shin.
(This letter is often used as a symbol of God in Judaism, as it is an abbreviation for God's name Shaddai. This usage
is seen, for example, on every mezuzah.)
Nimoy may also have derived the accompanying spoken blessing, "Live long and prosper" from this source, as the
last phrase of the blessing is "May the Lord be forbearing unto you and give you peace" (Numbers 6:24-26)."