I hear you.
I understand that Vulcan salute and phrase “Live Long and Prosper” has Jewish roots.
The salute for the Hebrew letter Shin meaning El Shaddai. And the blessing a shortened form of the blessing from the Law of Moses, if the children of Israel obeyed the Lord, their God.
Yes. Leonard first saw the hand shape that evolved into the Vulcan Hand Salute during the Rosh Hashana Services in Temple Mishkin T’Fillah in Dorchester MA, when he was a child. It is the Priestly Blessing from Numbers 6:
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“The Lord bless you and keep you;
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The Lord make His face shine upon you,
And be gracious to you;
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The Lord lift up His countenance upon you,
And give you peace.”’