Unbitrium (eka-protactinium) is the IUPAC name of the element 123, which has not been discovered yet.
Its name is provisional and is derived from the number 123.
Additional Info
In the fictional universe of Star Trek: The Next Generation, this element was apparently discovered and named. The episode "Rascals" depicted a "trans-periodic table," in a schoolroom set, which depicted element number 123 as being named jamesium, symbol Rj. The graphic was created by set artists, probably a homage to designer Richard D. James, and listed this element in the "gamma series."
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