The Oracle of K'Tal was a Vulcan spiritual figure.

Tuvok had a holographic simulation of the Oracle of K'Tal on the USS Voyager. In 2376, Tom Paris and Harry Kim reprogrammed the Oracle to wear pajamas. Kim later wondered how the Oracle would look in a sombrero. (VOY: "Live Fast and Prosper")

Shortly before, Harry had already planned to play another practical joke on Tuvok by having the monks of his holo-replica of the Temple of T'Panit recite Ferengi limericks instead of Vulcan prayers. (VOY: "Ashes to Ashes") It is unknown whether the temple is associated with the Oracle of K'Tal.