A Mini was a type of car.
History
Flo owned a Mini. (AUDIO: Horror of Glam Rock)
Mickey Smith once used his Mini to try to open the Heart of the TARDIS, but was unsuccessful. (TV: The Parting of the Ways)
Esther Drummond drove a light blue Mini. (TV: Rendition)
Amy Pond and Rory Williams used Rory's red Mini to get to the Royal Leadworth Hospital. (TV: The Eleventh Hour) The next year, they used another Mini, a beige one, to make marks on a crop field, shaped as the word "doctor", to get the Eleventh Doctor's attention. (TV: Let's Kill Hitler)
Clara Oswald used to drive a Mini. (COMIC: The Fractures)
Other references
One of the cockroaches inside Little Green Storage was the size of a Mini. (PROSE: Borrowed Time)