Δ:ʮ≠β

Δ:ʮ≠β, also written as Δ:y≠β, was a Time Lord and the Second Doctor's defence counsel during his trial. (PROSE: The Trial of Doctor Who)

The Old High Gallifreyan name was also inscribed in the Tomb of Rassilon. (TV: The Five Doctors)

Behind the scenes
This Time Lord is the only one named in The Trial of Doctor Who to have their name both handwritten and typed in the story. While it is typed as Δ:y≠β, the handwritten version is more accurately rendered as Δ:ʮ≠β in with Unicode characters.