Vulcan Salute emoji is the picture of a hand gesture, which looks like the ✋ Raised Hand with fingers brought apart between the middle and the 💍 Ring ones. This gesture was invented by one of the characters of ⭐ Star Trek series, who was the 👽 Alien. There, it meant the formal greeting and wish to prosper of his race. The fans of the series use it exactly in the same meaning – mostly, instead of “hello” or “goodbye” to a friend. Yet, it is already not only geek-only gesture and it is used in this sense not only by fans but even by those, who have never seen ⭐ Star Trek.
Examples of using
“Hello, my dear friend! 🖖”
“Goodbye and good luck to you! 🖖”