In reply to:
Perhaps the best English equivalents are themselves translations from the Vulcan: "Live long and prosper", "peace and long life".
Which hand signal is from the Kabballah - the mystical side of Judaism - and can be seen in paintings and images in some of the very old synagogues in S'fat (up in the Galil).
BTW - I understand there is something very significant about a person that can actually make this hand signal without any effort - and it happens that I am one of them, so I hope the significance is good!
Whaddyathink?
Shoshannah