Barkhan
From Tardis Wiki, the free Doctor Who reference
A barkhan was, in the words of Susan Foreman, a "distinctive type of crescent-shaped Saharan sand dune". She was already familiar with the dune type from seeing Lawrence of Arabia by the time her geography teacher Mr Grange made his Coal Hill School class draw diagrams of one on 29 March 1963. (PROSE: Time and Relative)
