The Stone of J'Kah (or J'Kah Stone) was a religious artifact of Vulcan origin.
The Stone of J'Kah was presented to Captain Jonathan Archer and his crew in 2151 in honor of their visit to the monastery of P'Jem. The Stone of J'Kah represented the foundation of everything the Vulcans believe in: a life of order and logic. When offering the Stone of J'Kah, the Vulcan speaks a traditional litany that has been passed down for generations: "Ishtaya kulah. Vestal ma etak J'Kah." The person presented the stone is to accept it, bow slightly, and observe a respectful silence for approximately five seconds. (ENT: "The Andorian Incident")