Thum·mim n. pl.  A mysterious part or decoration of the breastplate of the Jewish high priest. See the note under Urim.

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 Thummim
    perfection (LXX., "truth;" Vulg., "veritas"), Ex. 28:30; Deut.
    33:8; Judg. 1:1; 20:18; 1 Sam. 14:3,18; 23:9; 2 Sam. 21:1. What
    the "Urim and Thummim" were cannot be determined with any
    certainty. All we certainly know is that they were a certain
    divinely-given means by which God imparted, through the high
    priest, direction and counsel to Israel when these were needed.
    The method by which this was done can be only a matter of mere
    conjecture. They were apparently material objects, quite
    distinct from the breastplate, but something added to it after
    all the stones had been set in it, something in addition to the
    breastplate and its jewels. They may have been, as some suppose,
    two small images, like the teraphim (comp. Judg. 17:5; 18:14,
    17, 20; Hos. 3:4), which were kept in the bag of the
    breastplate, by which, in some unknown way, the high priest
    could give forth his divinely imparted decision when consulted.
    They were probably lost at the destruction of the temple by
    Nebuchadnezzar. They were never seen after the return from
    captivity.



 Thummim, perfection; truth