Skull helmet

From Tardis Wiki, the free Doctor Who reference

Skull helmets were skull-shaped helmets which were worn by the Sycorax warriors and scribe. (TV: The Christmas Invasion, PROSE: The Final Darkness)

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In 1599, the Tenth Doctor observed that an animal skull reminded him of a Sycorax in the presence of William Shakespeare, inspiring the playwright to use the name. (TV: The Shakespeare Code)