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Urim and Thummim

"And he put the breastplate upon him: also he put in the breastplate the Urim and the Thummim." Leviticus 8:8

The Urim and Thummim was carried in the pouch formed when the breastplate was folded over (see Exodus 28:30).

Best guess of the Urim and Thummim
“A Urim and Thummim consists of two special stones called seer stones or interpreters. The Hebrew words urim and thummim, both plural, mean lights and perfections. Presumably one of the stones is called Urim and the other Thummim. Ordinarily they are carried in a breastplate over the heart. (Ex. 28:30; Lev. 8:8.) …

“… Abraham had them in his day (Abraham 3:1–4), and Aaron and the priests in Israel had them from generation to generation. (Ex. 28:30; Lev. 8:8; Num. 27:21; Deut. 33:8, 1 Sam. 28:6; Ezra 2:63; Neh. 7:65.) …

“… Ammon said of these … stones: ‘The things are called interpreters, and no man can look in them except he be commanded, lest he should look for that he ought not and he should perish. And whosoever is commanded to look in them, the same is called seer.’ (Mosiah 8:13; 28:13–16.)

“The existence and use of the Urim and Thummim as an instrument of revelation will continue among exalted beings in eternity.” (McConkie, Mormon Doctrine, pp. 818–19.)

The Urim and Thummim of Aaron was not the same as that used by Joseph Smith, for the Prophet received the Urim and Thummim used by the brother of Jared (see McConkie, Mormon Doctrine, p. 819).