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 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.