Mx

Mx was a gender-neutral honourific used on Earth. This was Orr's preferred title, as they had no fixed gender. (AUDIO: Superiority Complex)

Behind the scenes
In the real world, Mx gained widespread recognition across the United Kingdom in the mid-2010s as a gender-neutral title on passports, driving licences, and in major institutions like banks, broadcasters and the Royal Mail.

It is generally pronounced mix, mux, or occasionally mixter.