"The Kohen Hand Gesture was performed in the Priestly Blessing, as the Kohanim stretch their arms and hands forward. They hold their hands together palms-down. They split their fingers so there are 5 spaces: one space between the thumbs, a space between the thumb and first finger."

So the Star Trek exemplar, popularized to where "we" see ourselves using it indiscriminately, was not so new, after all.

Source: http://www.cameranaked.com/FamousJewishActors.htm

Compare this image to "Jewish origins of the Star Treck hand sign, Page 1" in this same Image Gallery.

Numerology has a great influence upon the Kabbalah of Judaism. What does the number "5" reperesent?