One thing that I have known for a little while is the origin of the Vulcan Salute: Leonard Nimoy created the famous Vulcan salute based on a blessing performed by Jewish Kohanim, representing the Hebrew letter Shin (ש), similar to the position of the thumb and fingers in the salute.
The accompanying spoken blessing is "Live long and prosper." The lesser-known reply is "Peace and long life." This is similar to a common Hebrew greeting, Shalom aleichem, meaning "peace be upon you", and its reply, "upon you be peace" (aliekhem shalom).
Being Jewish, and totally into Star Trek, I thought this was pretty cool. I think my next tattoo might be the image in the link below, but with "Live Long and Prosper" underneath it, in Vulcan. *Yes, I am a reform Jew with a different view on tattoos, and have several (including a a Jew-punk star of David)*