Spatio-temporal hyperlink

A spatio-temporal hyperlink was what the Tenth Doctor called a connection between the SS Madame de Pompadour in the 48th century and 18th century France rather than referring to it as a "magic door." It had been established by the Clockwork Droids in their quest for "spare parts" -- specifically, the brain of Reinette. (DW: The Girl in the Fireplace).