Collar insignia
From Tardis Wiki, the free Doctor Who reference
Collar insignia was what Runcible termed the distinguishing feature of the Time Lords' ceremonial robes, which bore the colours of their Chapter. (TV: The Deadly Assassin)
By the fall of Gallifrey, the collar insignia of High Council was all gold. (TV: The End of Time) Rassilon himself wore collar insignia in his post-Time War incarnation. (TV: Hell Bent)
