(New York Stock Exchange) Admitted to quotation in the unlisted department, that is, admitted to be dealt in on the floor, but not to the "regular list."
(b)
Not listed in the telephone directory; of telephone numbers; as, an unlisted number.
... became a call-boy; and as early as '93 he became a "vagabond"—the law's ungentle term for an unlisted actor; and in '94 a "regular" and properly and officially listed member of that (in those days) lightly-valued and not much ... — Is Shakespeare Dead? - from my Autobiography • Mark Twain