Tracking sensor
From Tardis Wiki, the free Doctor Who reference
Tracking sensors appeared as the ears of K9. (PROSE: The Visual Dictionary [+]Loading...["The Visual Dictionary (2007 reference book)"]) A hypothetical future K9 model, sketched in How to be a Time Lord by the Eleventh Doctor, functioned as a microwave with one ear dispensing ketchup and the other dispensing mustard. (PROSE: How to be a Time Lord [+]Loading...["How to be a Time Lord (novel)"])
The K9 Mark 2 model following K9 Mark I's regeneration featured larger silver aerials. (TV: Regeneration [+]Loading...["Regeneration (TV story)"])
