Nubian was a term used to describe someone of African decent.
In 2267, Trelane asked Captain Kirk if Lieutenant Uhura was "a Nubian prize, taken on one of your raids of conquest...?" (TOS: "The Squire of Gothos")
A Nubian is a member of the ethnic group living in Northern Sudan and Southern Egypt.
Nubian has also been used poetically to refer to any black African.