∞×∑û≠∆

∞×∑û≠∆ was the secretary of the Order of the White Peacock. (PROSE: A Choice of Houses)

Behind the scenes
Several previous materials established that Time Lords have names like this.
 * The Making of Doctor Who identified the Doctor's name as ∂³∑x².
 * Some other episodes of the Doctor Who TV series have also shown Time Lords to have similar names.