The TARDIS (/ˈtɑːrdɪs/; acronym for "Time And Relative Dimension In Space" is a fictional hybrid of the time machine and spacecraft that appears in the British science fiction television series Doctor Who and its various spin-offs. Its exterior appearance mimics a police box, an obsolete type of telephone kiosk that was once commonly seen on streets in Britain. Paradoxically, its interior is shown as being much larger than its exterior, commonly described as being "bigger on the inside".

Doctor Who television series element
TARDIS prop used between 2010 and 2017
First appearanceAn Unearthly Child (1963)
Created by
GenreScience fiction
In-universe information
TypeTime machine/spacecraft
FunctionTravels through time and space
Traits and abilitiesCan change its outer dimensions and inner layout, impregnable, telepathic

Due to the significance of Doctor Who in popular British culture, the shape of the police box is now more strongly associated with the TARDIS than its real-world inspiration. The name and design of the TARDIS is a registered trademark of the British Broadcasting Corporation (BBC), despite the fact that the design was originally created by the Metropolitan Police Service.[1][2]

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