Mx (title) - Wikipedia
https://en.wikipedia.org/wiki/Mx_(title)Mx is an English language neologistic honorific that does not indicate gender. It was developed as an alternative to common gendered honorifics, such as Mr and Ms, in the late 1970s. It has been used by non-binary people as well as those who do not wish to implicate a gender in their title. It is a gender-neutral title that is now widely accepted by the Government of the United Kingdom and many businesses in the United Kingdom. It is included in many major English dictionaries.