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. It represented the foundation of everything the Vulcans believed in: a life of order and logic. When offering the Stone of J'Kah, the Vulcan would speak a traditional litany that had been passed down for generations: "Ishtaya kulah. Vestal ma etak J'Kah." The person presented the stone was to accept it, bow slightly, and observe a respectful silence for approximately five seconds. The Andorian, Shran, used the stone to smash the visiting Enterprise crewmembers' communicators. (ENT: "The Andorian Incident")