Mark Lenard as Sarek

Mark Lenard (1924-1996) as Sarek

"Peace and long life," was a Vulcan blessing, typically used when characters greet or depart. First used in the Star Trek episode "Amok Time" in 1967, it has been liberally used throughout the franchise ever since.

It is typically accompanied by the Vulcan Salute and is used as a return to the blessing, "Live long and prosper."

Outside of the Star Trek universe, the phrase and Salute are often used among fans.