Binary system

A binary system (or binary star) was a star system consisting of two stars.

Sirius was, as the Eleventh Doctor pointed out to Henry Avery, a binary system. (TV: The Curse of the Black Spot)

Lucie Miller hoped that her first visit to another planet would be to one that had two suns. (AUDIO: Blood of the Daleks)

Planets known to have two suns included Aridius (TV: The Chase), Caresh (PROSE: The Suns of Caresh), Coralee (PROSE: Storm Harvest), Corbo (PROSE: The Devil-Birds of Corbo), Dido (PROSE: The Rescue), Gallifrey (TV: Gridlock), the planet of the Gonds (TV: The Krotons) and the Sense Sphere (PROSE: The Monsters from Earth)