Urim and Thummim

Certain sacred objects (whose precise form and nature is unknown) that were worn on the breastplate of the Jewish high priest, as described in the Bible, and used in divination or casting lots.

(Mormonism) A set of seer stones, bound by silver bows into a set of spectacles, that founder Joseph Smith, Jr. said he found on the hill Cumorah (which is actually a drumlin) and used to interpret the golden plates.