U•rim and Thum•mim
Pronunciation: (yoor'im, oor'-; thum'im, toom'-), [key] Judaism.
objects, possibly made of metal or precious stones and inscribed with symbols, worn in the breastplate of the high priest and used, perhaps like lots, to determine God's response to a question answerable by “yes” or “no.” Ex. 28:30.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.