For Uncharacterized ORFs we have a term and definition in Yeast Genome.

ORFs that are likely to be real due to the existence of orthologs in one or more other species, but which are not supported with specific experimental data demonstrating that a gene product is produced in S. cerevisiae. A few named genes may be in this class if there is no experimental evidence that they are produced. Evidence from large-scale analyses that indicates an ORF may be biologically relevant is sometimes but not always enough to upgrade an ORF from "Uncharacterized" to "Verified", depending on the individual case.
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