From John DiMarco:
Peace and long life. The iconic Vulcan salute was first seen and heard during The Original Series, and since then it has appeared throughout the Star Trek franchise (but apparently not in Deep Space 9). This video documents the use of the famous greeting from TOS to Prodigy. Fun facts: the V-shaped sign was suggested by Leonard Nimoy based on hand gestures he had observed in synagogues in his youth, while the phrase “live long and prosper” was coined by writer Theodore Sturgeon.