Live Long and Prosper (Vulcan salute)
|See also:||pon farr, mind meld, Vulcan|
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Live Long and Prosper is a now-famous hand gesture performed when two Vulcan characters either greet one another or take their leave. The phrase "Live long and prosper" is accompanied by this formal hand gesture. The (lesser known) response is "Peace and long life."
The single canon reference to this action being called a "salute" is in the episode "Journey to Babel", where Dr. McCoy asks Spock, "How does that Vulcan salute go?" Leonard Nimoy also calls this "the Vulcan hand salute" when he talks about it in interviews and documentaries. Fans generally refer to it this way as well. One very early example is this December 1967 reference: "Many thanks, and a Vulcan salute ... for suggesting [this] carbonzine become a fanzine." 
In January 1968, the zine The Crewman's Log #5 had instructions on how to make "the Vulcan Salute" symbol with one's hands; it involved lots of practice and the application of "Scotch Tape" which one left on one's hand all day to "train your fingers."
There are at least two different versions of the Vulcan pronunciation of this phrase in common use:
- Dif-tor heh smusma is the version seen on most "official" Star Trek sources such as Memory Alpha; it was first used in Star Trek: The Motion Picture (1979).
- Mehe nakkhet ur-seveh is often seen in fanfic, but is not canon for the TV show or films; it has a later origin in Diane Duane's novel Spock's World (1989).
The Hand Gesture in Canon
The Vulcan salute was performed in canon for the first time in the Star Trek: The Original Series episode "Amok Time." Celia Lovsky as T'Pau is the first person viewers saw raising her left hand in the now-familiar gesture.
Leonard Nimoy writes in "I Am Not Spock" that he based the hand gesture on the "Priestly Blessing" performed by Jewish Kohanim, the priests of the Hebrew Tribes, with both hands. It represents the Hebrew letter Shin (ש), which has three upward strokes similar to the position of the thumb and fingers in the salute. The letter Shin stands for Shaddai, meaning "Almighty (God)". The words of the blessing are from Numbers 6:24-26: "May the Lord bless you and keep you," and so on. Nimoy says he was also told that the Shin invokes the Shekinah, the female aspect of God, and it is she who enters the temple and blesses the people.
Live Long and Prosper: Valediction Used by Fans
"Live Long and Prosper" (commonly: "L.L.& P.") is used by some Trek fans as a closing to letters and messages to each other. For example: "See you at the next con! L.L.& P., MPH." Leonard Nimoy signed all of his Twitters with LLAP.
On January 15, 2016, Dr. Philippa Whitford, the Scottish National Party's MP, spoke in the House of Commons supporting the establishment of Britain's first spaceport to be in Scotland. She concluded with the salute and the words "Live long and prosper."
The Hand Gesture in Fanon
Jacqueline Lichtenberg incorporates the gesture in the philosophies expressed in her Kraith series. Here, it is an expression of devotion to Surak's Construct. The thumb held apart from the other fingers represents reverence for privacy: the small finger, IDIC; the third finger, Nome, meaning All; the middle finger, reverence for life; and the index finger, the doctrine of the Domination of Logic. 
The Hand Gesture Portrayed in Fanworks
inside front cover of Energize!
back cover of Plak Tow #6
front cover of Grip #4
inside Menagerie #10, Doug Rice
front cover of Images and Dreams #4
back cover of Saurian Brandy Digest #4
front cover of In a Different Reality #2
cover of Eridani Triad
back cover of Menagerie #11
cover of a convention program
from the back cover of Trexperts #42, Robert Bruce Lloyd
cover of Vootie #1