Iron maiden

Iron maidens were torture devices used in the Middle Ages.

disguised his TARDIS as an iron maiden while visiting 1215, (TV: The King's Demons) and again inside a museum exhibit in the 20th century. (PROSE: Tabby Cats And Time Lords)

Another TARDIS, this time owned by the Clocksmith, also disguised itself as an iron maiden. (AUDIO: The Eighth Piece, The Doomsday Chronometer)

When Merlin threatened to use an iron maiden on Rory Williams, Rory thought of the band, and said he preferred Oasis. (AUDIO: The Once and Future Nurse)