Circle
A circle was a fully curved shape or path. It could also describe the repeating of a series of events. (TV: The Myth Makers [+]Loading...["The Myth Makers (TV story)"], Full Circle [+]Loading...["Full Circle (TV story)"]) 'Going round in circles' also referred to repeating the path trodden more than once. (TV: The Space Museum [+]Loading...["The Space Museum (TV story)"], The Mind Robber [+]Loading...["The Mind Robber (TV story)"], Carnival of Monsters [+]Loading...["Carnival of Monsters (TV story)"], AUDIO: Equilibrium [+]Loading...["Equilibrium (audio story)"])
In the 1970s Azal generated a heat barrier that had a perimeter of an unbroken circle of ten miles in diameter, with the Devil's End church in its centre. (TV: The Dæmons [+]Loading...["The Dæmons (TV story)"])
Biology
Mutation and evolution could move in circles, with patterns repeating themselves, the First Doctor observed the changes in the Daleks and the Thals on Skaro as having moved in circles. (TV: The Daleks [+]Loading...["The Daleks (TV story)"])
On Alzarius upon discovering the evolutionary paths of their people Decider Draith told Adric "Tell Dexeter we've come full circle!". (TV: Full Circle [+]Loading...["Full Circle (TV story)"])
Culture
To 'not be in the same circles' was to not associate in the same cultural of societal group; to be outside the circle was to be excluded. (AUDIO: A Thousand Tiny Wings [+]Loading...["A Thousand Tiny Wings (audio story)"])
A group knowledgeable people was referred to as being within those circles, such as 'astronomical circles'. (TV: The Tenth Planet [+]Loading...["The Tenth Planet (TV story)"]) Or those within a political association. (TV: Timelash [+]Loading...["Timelash (TV story)"], PROSE: The Dying Days [+]Loading...["The Dying Days (novel)"]) Especially to be within an "inner circle" was to have a close association with power. (TV: The Enemy of the World [+]Loading...["The Enemy of the World (TV story)"])
The Sisterhood of Karn would routinely form circle with their sisters on Karn. (TV: The Brain of Morbius [+]Loading...["The Brain of Morbius (TV story)"])
When brought before the Dalek Eternity Circle, the War Doctor noted that the Daleks were arranged in a hexagonal configuration instead of a circle, leading him to question the group's name. (PROSE: Engines of War)
Design
The entrance to the secondary control room in the Doctor's TARDIS featured a circular stained glass window. (TV: The Hand of Fear [+]Loading...["The Hand of Fear (TV story)"], PROSE: Blood Heat [+]Loading...["Blood Heat (novel)"])
Mathematics
In 1638 a mathematician engaged by Lady Peinforte described an orbit as 'circling the heavens'. (TV: Silver Nemesis [+]Loading...["Silver Nemesis (TV story)"])
Pi
The Greek letter pi was, according to both Tegan and the First Doctor, the ratio of any circle's circumference to its diameter. This was considered to be "basic mathematics". (TV: The Five Doctors)
The Twelfth Doctor used pi to communicate with the Boneless, as the basic mathematics was the only common thing he could find with the creatures from another dimension, reasoning that even in a flat world that would have circles. (TV: Flatline)
Security
A chalk circle, along with Excalibur protected Ace and Li Shou Yuing from Morgaine in Carbury in 1997. (TV: Battlefield [+]Loading...["Battlefield (TV story)"])
On Deva Loka circa 3984 the Mara was trapped using a circle of mirrors. (TV: Kinda [+]Loading...["Kinda (TV story)"])
Technology
On Skaro in order to test the control interface with a Dalek and Clara Oswald Missy instructed her to "circle right" and "circle left", although this was mostly to turn or rotate in these directions. (TV: The Witch's Familiar [+]Loading...["The Witch's Familiar (TV story)"])
Time travel
In 1963 when being told of time travel Ian Chesterton exclaimed that "time doesn't go round and round in circles.". (TV: An Unearthly Child [+]Loading...["An Unearthly Child (TV story)"])
